Poor people are awful to live near. I've avoided the problems mentioned here simply by always living in apartments that require proof of income for all tenants. The minimum required income doesn't even have to be super high. There is a world of difference between a complex that takes all-comers and one that even requires people to prove that they make, say, $35K+. At very least, it means that your neighbors have somewhere to go and something to do other than just hanging out all day every day.