. .. a slumlord's dream.Yeah, I've seen this a lot. Its like a rental disease. Its unfortunate but its also caused by management that is not closely involved with the renter. Also if a renter is a pig they need to go. They're expected to keep up appearances and if they don't they go. After a while you write up more and more rules to keep order. You learn by experience and the house gets better and better. Also its important to have an open ear to the neighbors. They don't want problems and you don't want problems. You both can work together in getting rid of problem renters. They can be your external eyes.
Why the hell do your neigbours want "your" problems.
I'm amazed of your expectation that the "neighbours" should be working "together" on "your" problem of renting to pigs. Do your neighbours get a cut on your rent to "work with/for you"?
Your attitude here reminds me of a slumlord (only it's a slum-b1tch) 2 streets down (thank God, not next door to her but not far enough away), harassing her neighbours on both sides of her slumhouse and telling people that they're not allowed to use the sidewalk on her side of the street.