It is really targeted at gross overuse. for sure. i just ensure it's in the contract to that I can exercise the RIGHT to charge it if I want to. 

I don’t have an STR myself but have helped a friend set up and manage a couple last year and it’s not as simple as it used to be. 

Exercise caution and explore alternatives before considering them

Plain and simple, knows his stuff.

Can I still do simple 4 box calculation? 

Your mentor has needs; try to meet them and develop a mutually beneficial relationship.A mentor can benefit your growth, but it's not as simple as one post on a forum full of strangers.

It can be a simple one page contract b/w you too at an agreed upon rate.

I know I can go through a lawyer but I was told it is a fairly simple process hence want to DIY.Regards,Xuming

It could be something as simple as a toilet running. 

Here is an article i found with a simple google search: about $5000 but i thought quiet title in georgia was actually higher.Tax Deed Services For Owners of Tax Deeds - Gomez & Golomb LLC