Apartments are something of a crap shoot. You may have fantastic neighbors or really terrible ones.

Be kind to your neighbors, even if they're dicks. If someone is playing music until late at night, fighting, making noise, stinking up the building with cooking, the most you can do is say something to them, but use tact. Being on good terms with them will go a long way. Don't threaten or try to retaliate. Deal with it the best you can.