I have customers who want half an inch plowed and others who want nothing less than 3.

Don't give an inch with students.

Set it to cool down the place just before I'd get home from work.http://www.homedepot.com/p/Lux-7-Day-Touchscreen-U...Something else that really helps keep the place cooler, is to run a large floor fan, like this:http://www.pattonproducts.com/fans/patton-18-inch-...They make different sizes.  

That can be a long drywall screw, something to go over the screw threads (a 1 or 2 inch piece of old garden hose, or several wraps of duct tape, or similar), and a zip tie. 

Leave an inch uncaulked in the very back so leaks can be detected sooner than later. 

Dropping a 3 inch pipe down a 4 inch cleanout is an old trick .

It is recommended to tile about 6 inches ABOVE the shower head. 20 Beautiful Bathroom Designs with Pedestal Sinks (nimvo.com)https://www.google.com/url?

If I have to charge someone for new damage or cleaning I want to make sure every single thing inch is documented. 

Although very unlikely, babies and toddlers can still drown in just a few inches of water if left unattended.Your tenants need to get rid of that trampoline, asap. 

I've even offered to pay them JUST TO HAVE ACCESS TO THE 24 INCHES!