Make a list

When renting any space, make a list of any and all issues with the space before you take occupancy.  Are there existing stains in the carpet, holes in the wall, broken door knobs?  No matter how small an issue may be, write it down so that you have a record that you didn't cause the damage.  Better yet, take pictures.  Provide the list to your landlord and keep a list for you.  This way if there is any dispute at the end of the lease, you have evidence that you didn't cause the damage.