Take pictures and video of the property prior to move in with the tenant. You will be shocked how many times you hear "why did you keep part of my deposit? I left it nicer than when I got it" even when there are holes in the wall and a dog chewed the carpet up. This is especially true if you have students. So many times I have had a mom call me yelling because her kid would never not leave a house in pristine condition. I always say, let me email you the before and after pics so that we are on the same page and both know exactly what we are discussing. Strangely I almost never hear back after that.