Problem with my landlord!!!?

There are Peeping Tom landlords, and those who freely come into your back yard to pick fruit and see what you're up to. It matters not that they own title to the property. These are all violations of the right to possession, not of title.
The difference between the sidewalk and your apartment is that you have the right to exclusive possession of your apartment against all the world, even the landlord. When the landlord rents your apartment to you, he is selling you the right to exclusive possession; that is what renting is. If the landlord would prefer to have that right, he doesn't rent it; once he does, he can't come into your apartment without your permission, or under very narrow legal limits without your permission. Otherwise, it's trespassing, breach of contract, invasion of privacy, breach of quiet enjoyment, and disorderly conduct.
You can arrest and sue the landlord and whoever else comes in with their permission. Call the police and make a citizen's arrest for trespass and disorderly conduct [call his station Watch Commander if the officer refuses, and file a complaint with the station's Internal Affairs]. Sue the landlord and whoever for $7500 in small claims court for trespassing, breach of contract, invasion of privacy, and breach of quiet enjoyment; if you are two or more tenants, each can separately sue them for $7500, and a joint action is not required.
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Civil Code 1954
Under Civil Code 1954 [see below], the landlord may enter your unit without your permission ONLY:
(1) in an emergency, like a fire or broken pipe, or
(2) upon reasonable advance notice, and then ONLY:
(A) to inspect, repair, or show the apartment,
(B) during normal business hours [presumably Mon.-Fri. 8AM-6PM]
(C) 24 hours is presumed to be sufficient notice
(D) You do not have to be home when they come, but the landlord is liable for anything stolen or broken.
(D) The notice must identify a date and reasonable time range [like an hour] within which the entry will occur
(E) The notice MUST be written [not oral or e-mail], except if a WRITTEN notice that realtors will be showing the property is given, for the next 120 days only an oral telephonic 24 hour notice is required [business hour limit still applies]
(G) The right of entry can't be "abused", so that an open house, lock box, extended repair, daily entry, or excessive range of entry time are probably all "abuses" which you have the legal right to prevent.
The nature of the reasonableness of the notice seems to be to give you time to pick up the place, secure pets, arrange to be there, or otherwise make ready for the visit. The law is not clear, here, and the above is the best interpretation of what the law probably is.
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Practical Solutions
These entries can be restricted by practical means, since there is no legal authority (pro or con) to do so:
(1) Write a letter to the owner, carbon copy to the local police, about the manager's burglary.
(2) Change the locks, or add chain lock to the door [example], so that the manager's entry is restricted. You should plan on moving, if the owner does not restrict the manager's entry, but at least your privacy will be protected meanwhile.
(3) Sue the manager and landlord for their trespass and invasion of privacy, in small claims court [maximum is $7,500]. Maybe they'll think twice next time. Each time, it's a different lawsuit. Each person so affected can separately sue.
(4) Circulate a flier to all of your neighbors about what happened. Not only can they take precautions, but many may move, punishing the landlord with lots of vacancies. Many may choose to join you and sue the manager and landlord, too.
(5) For the realtors showing your house, call the broker who has listed the house and tell them that no one is to enter without reasonable advance notice, like 24 hours, and that they should immediately remove the lock box, or you will do it when you change the doorknobs. Tell them that any realtor or prospective buyer will be sued, and the police will be called to charge them with criminal trespass, should they dare violate this. You can also tell each prospective buyer about all of the problems with the house, and the neighborhood, so that the brokers will not want to show the property, at all. In the alternative, you can work out a cooperative arrangement with the broker to ensure that your privacy is respected. They'll get the point.
The law now requires a landlord to provide dead bolt locks on the doors and adequate locks on the windows of a residential rental unit. Civil Code Section 1941.3. Failure to do so violates the "warranty of habitability", permitting the tenant to move out, repair and deduct, or withhold rent as remedies. You can use that law to put them on, deduct the cost from your rent, and have the additional barrier to their illegal entry.
CIV Â§1954. Entry by Landlord
(a) A landlord may enter the dwelling unit only in the following cases:
(1) In case of emergency.
(2) To make necessary or agreed repairs, decorations, alterations or improvements, supply necessary or agreed services, or exhibit the dwelling unit to prospective or actual purchasers, mortgagees, tenants, workers, or contractors or to make an inspection pursuant to subdivision (f) of Section 1950.5.
(3) When the tenant has abandoned or surrendered the premises.
(4) Pursuant to court order.
(b) Except in cases of emergency or when the tenant has abandoned or surrendered the premises, entry may not be made during other than normal business hours unless the tenant consents to an entry during other than normal business hours at the time of entry.
(c) The landlord may not abuse the right of access or use it to harass the tenant.
(d)(1) Except as provided in subdivision (e), or as provided in paragraph (2) or (3), the landlord shall give the tenant reasonable notice in writing of his or her intent to enter and enter only during normal business hours. The notice shall include the date, approximate time, and purpose of the entry. The notice may be personally delivered to the tenant, left with someone of a suitable age and discretion at the premises, or, left on, near, or under the usual entry door of the premises in a manner in which a reasonable person would discover the notice. Twenty-four hours shall be presumed to be reasonable notice in absence of evidence to the contrary. The notice may be mailed to the tenant. Mailing of the notice at least six days prior to an intended entry is presumed reasonable notice in the absence of evidence to the contrary.
(2) If the purpose of the entry is to exhibit the dwelling unit to prospective or actual purchasers, the notice may be given orally, in person or by telephone, if the landlord or his or her agent has notified the tenant in writing within 120 days of the oral notice that the property is for sale and that the landlord or agent may contact the tenant orally for the purpose described above. Twenty-four hours is presumed reasonable notice in the absence of evidence to the contrary. The notice shall include the date, approximate time, and purpose of the entry. At the time of entry, the landlord or agent shall leave written evidence of the entry inside the unit.
(3) The tenant and the landlord may agree orally to an entry to make agreed repairs or supply agreed services. The agreement shall include the date and approximate time of the entry, which shall be within one week of the agreement. In this case, the landlord is not required to provide the tenant a written notice.
(e) No notice of entry is required under this section:
(1) To respond to an emergency.
(2) If the tenant is present and consents to the entry at the time of entry.
(3) After the tenant has abandoned or surrendered the unit.

Under Civil Code Section 1950.5 [see below], the landlord can charge no more than 2 months' rent for an unfurnished apartment as a security deposit, and 3 months for a fully furnished unit.
Except for eviction for your breach of contract [such as nonpayment] the landlord MUST advise you of your right to a "preliminary inspection" to be held within the last two weeks of your tenancy, and with enough time for you to make repairs or cleaning required to avoid those deductions from your deposit. IF you request that inspection [and you always should], the landlord must do so where you have the right to be present, and give you a written list of proposed deductions then and there.
You then have the right to make the repairs and do whatever cleaning is required, before you leave, so as to avoid those cleaning and repair deductions. If you did not cause the damage, or it was from normal usage, or it is not damaged, then you do not have to fix it, but you can take pictures of it, make notes about it, and get witness statements of it to later help you at trial, if necessary. You only have to return it to the state of cleanliness that you got it in, so if you were given a dump, you return a dump, not a palace. It is best for you to hire a professional cleaning crew to shampoo the carpet and clean the place, so that you have a receipt to prove that no further cleaning was necessary. You can get such a crew by recommendation from a property management company or other maid or janitorial service. With no furniture left, this should be much cheaper than a fully furnished place.
Before you leave, take pictures of everything. The building from the front and back, each room from the doorway and opposite side, every defect that was listed, every defect that you noticed was there [even if not charged for it], by both a distance shot and a close-up. Use a flash if necessary. Use the Habitability Checklist in