I just looked up "rate my landlord" and it appears there is a site. Doesn't look like there is much to it. 551 landlords added, many of them with no ratings. So I guess looking through that rating system would be a good place to start to see what you should learn and have a good handle on. Those are the basic areas you should be business savy about, not friendly with. Keep the apartments in good working order and properly attend to all legal requests and concerns.