How often do you do apartment inspections and rules??

[Dane Delatte]

As a property manager I have been dealing with tenants hanging a lot of things on the walls and when they move out I have to many little holes in the walls such as nail holes, hooks still in the walls that I assume were used to hang things on the walls. 

So my questions are, How often do you do apartment inspections and what are some you guys rules on hanging things on the walls such as pictures and other things that put holes in the walls that have to be filled in prior to a new tenant moving in?