Hubby & I are landlords for a house and an apartment house in a small college town. We rent our properties on an annual June-May lease, but are pretty liberal about the kids having to leave mid-year (read... whoops! partied hearty & flunked out!!) as it's pretty easy to fill vacant apartments without even advertising. BUT - if a kid trashed the apartment, the kid's going to pay for repairs, cleaning, out of their security deposit. I have no problem asking for rent after they vacate when I can't rent the place while repairs are being made.
As with mud, life, too, slides by.