Not sure if there is anything else but an attorney can advise other steps to protect yourself. 

Lessons learned?

It may be a good idea but I'm not sure how long it's self-sustaining. 

The unit is in good shape I’ll just make sure after they leave.

Lessons learned?

I was thinking of putting the keys in a lockbox and asking the person interested for a copy of their drivers license and Credit card to make sure no damage is done to the property and keys are returned.

The cash flow in the McAllen area looks promising, and there seems to be a lot of multi family units for sale (not sure if that’s a good or bad sign).

When doing your calculations - be sure to include principle, interest, property taxes (what your new ones will be - not what the current ones are - because after 1 year they reset to what you paid on the property), property insurance, and a maintenance reserve (we use $100/door/month on maintenance).  

Lucie, and Palm Coast; however, I am also very interested in learning and exploring opportunities in additional markets.

It takes a bit of time to learn the craft, but its not that hard to outperform 90% of hosts.