A、Ignorance of the signed agreement can be excused. B、The security deposit cannot always be fully returned. C、A good roommate is

The procedures for renting an apartment in different counties, and within the same area, city, or local area, can differ widely, and thus, knowing what to expect can help you in your apartment search.
    First of all, decide on the type of apartment you want to rent. How big of a place do you needy How much money are you willing to spend? Is public transportation available nearby? Think carefully about the place for you.
    Next, many apartments are advertised in the local newspaper, and these listings generally described the size, location, and amenities of the place. Looking over these ads will give you a general idea of the types of apartments available. Ask your friends and teachers if they can recommend any specific place to live. Other students might be looking for roommates, and this might be a good way to minimize your apartment search. Compare what they tell you to what you find in the newspaper.
    Then, figure out the exact costs for renting an apartment and determine your budget.  In addition to your first month’s rent, you might have to pay a security deposit to cover any damage to the apartment. The amount you get back when you move varies widely, but don’t expect to receive the entire amount because landlords sometimes deduct money for regular maintenance including carpet cleaning and new paint.
    Finally, be sure to carefully read and understand the terms of the rental agreement because once you sign, you will be bound to uphold the terms of the contract. Ignorance is no excuse.  Can you keep pets in the apartment? Is smoking allowed? How much notice do you need to give the landlord before you move out? Ask questions if you aren’t sure.