Noise complaints, parking issues, claims by some of paying lower rents just to get under the skin of someone they don't like or claims of special treatment or petty complaints about neighbors.

This is almost as bad as an elderly tenant I once had who complained of a lack of water in his washing machine and a loud clicking noise He had turned off the hot water.

I know the only way to win is to go out and grind.  

Specifically noise complaints.

I learn the hard way by just getting in there and grinding it out.

These metrics serves as a good starting point in filtering the noise.

You don't have to do anything bad or wrong to get people to have an axe to grind with you.

Not safe for kids and the noise.  

Lot's of grinding by a solid PM to keep that property going.You have to remember when PM's say 10% or less etc. they are wanting nice areas with low headache.

Keep grinding my man.