But the real kiss of death was their arrival and documentation (with photos) of the poor & inconsistent cleaning.

The IRS defines a “quality” cost segregation study as “a study that is both accurate and well documented with regard to” 1) the classification of property into classes, 2) Explanation of rationale for the classification of the property and 3) substantiation of the cost basis of each asset and reconciliation of the total allocated costs to total actual costs.

Document every communication in writing!

When it comes to taxes, the key to successful planning is documentation; retain all records of spending, as all those costs can be deducted.”

Employment Verification Something to be aware of is people forging these documents on the application.

For example we invest in mortgage notes so we have an AI agent that only scans the documents we have and lists and if we asked a question like "who are our top rates attorneys in texas", it will give me the results vs. having to search files.

Fellow STR owner/manager from TX.I do think there is value in having some pre guest documentation in the event that you have a guest come in and make false claims about cleanliness, etc. 

Would have to review documents about "waste" question.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

We take ID's for all guests (in a website called Chekin) so would have documentation the booking guest is above 21.