It is a big investment, but you will have improved the property greatly, and enhanced it's value.And, ask him to do a cooling and heating load calculation to determine what size equipment you need. 

After you see they a good tenant then gradually increase rent, also a few cosmetic enhancements can go along way in justifying the rent increase and their preception of the increase. 

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. 

@Martin Lopez  A warm welcome to BP Community - a place to enhance and share your REI knowledge.

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

In order to help alleviate these difficulties, and to enhance his/her ability to live independently and to fully use and enjoy the dwelling unit you own and/or administer, I am prescribing an emotional support animal that will assist [FIRST NAME] in coping with his/her disability.I am familiar with the voluminous professional literature concerning the therapeutic benefits of assistance animals for people with disabilities such as that experienced by [FIRST NAME].

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.