I found my property managers (plural), by asking hard questions. My first guy I was a bit naive and didn't ask many questions. He's turning out to not be that great. The second one I have returns my calls on time, points me in the direction I want to go because he knows my goals, tells me what areas to avoid, and has been well worth the money I've paid him.
I'd say ask some questions that might be difficult for a shady person to answer, but easy for an honest one. For example, I asked "If I have a problem after hours, who can I call"? My not so great property manager said "Oh, there's an after hours number you can call that you can leave a message with and we'll get back to you". I tried calling that one to see response times, and it was hours. Not good if there's a leak.
The good one I asked the same question and he gave me the after hours number, which a live person answered, his cell number (which I will never call unless there's an absolute emergency that only he can fix), and a number of other ways.
The difference is night and day with property managers. I don't expect them to fall all over themselves to kiss my ***, but at least be available within a reasonable amount of time.
Hope that helps!