The tenant should leave the property in the same general condition as it was when he/she moved in excluding 'normal wear & tear'. Some landlords tend to abuse the meaning of normal wear & tear. The tenant should clean the stove before they leave, but to try to charge the tenant the cost to replace the hardwood floors would be more than just a stretch and the tenant would probably easily win in court. Trust me, the costs & hassle of going to court on something like this is not worth it unless the tenant really trashed the floors.
It's always a good idea to take pictures of the unit when the tenant moves in so you can refresh their minds as to how it should look when they move out.