Credit scores, criminal report, rental history with dates, eviction reports, employer information......?

Is there a clause in your lease for vacating premises without notice, or criminal activity?

No offense, but it's the rare "up and coming" area that has $20K duplexes.

ALWAYS run credit and criminal checks and verify their rental history.

Then each trespass attempt is a arrestable offense.

Its really criminal in many ways in my opinon..

Assuming everything else is equal, (no criminal records, past evictions, and they applied at roughly the same time), I'd choose the second applicant based on income.

6)  Are you prepared to be sued or named in a criminal suit if your tenant in some way wrongs - or is accused to doing wrong - to an airbnb guest?  

You can call the police and shoot for something like theft by conversion or fraud, but they are probably going to tell you your only recourse is a civil suit Its a breach of contract, I dont know that they'd call it a criminal act from what you've described.

@Curt Davis no offense curt, why should I bring them to you when I have no problem moving them myself.