When you do one of these homes it needs to be purpose built preferably from some junk house that needs all new everything. Then you can kid proof it in many ways like using plywood under the Sheetrock so they can't put holes in it, making each room furnished including their own refrigerator and each room have a lock and deadbolt.
The floors can be done in acid stained concrete that is nearly indestructible, the garage can be divided into storage lockers and one room for an office so you have reason to be there at any time. Security cameras on the front door sides and back of the home all outside, this protects your property and it could save a kid from trouble if they are blamed for something they didn't do away from the home. It also allows you or their parents to check on the home anytime on a smart phone.
I would provide free cable and wifi, the house would be supplied with a nice but cheap leather couches, you know the thick leather that lasts a long time. Use concrete counters in the kitchen, they are cheap to make, look good when stained and last a long time.
The backyard would get a heavy duty picknick table with a cheap umbrella, some wood beach chairs and a gas BBQ. The yards would be taken care of and a maid service would clean the main part of the house once a week.
There is a strict policy of no overnight guests and no parties in the contracts!
The advantage of collage rentals is you can make twice as much money on the same house!
