He also has concerns about 'finding someone qualified that will take care of the places' as lots of newbies or less attentive owners might not keep them up and then weasel out down the road.

(I myself travel from SC to MD Anderson)What I'd like to know, is what's the market like for AirBnBs down in Houston, specifically near the Texas Medical Center.

Especially foster children with medical needs. 

It also kind of sounds like you weren’t very attentive in fixing actual problems.

and therefore you can command more attention.

Meaning, your investment could actually end up losing you money unless you are very attentive and hands on. 

It all depends on how much attention they’ve been getting and how long they’ve been sitting on the market.I imagine being able to get it zone MF-4 would allow you to pay somewhat of a higher price for it vs SF-3.

If they are in a bad area and the tenant class in lower that is probably why they require so much attention.

The lease is new and the tenant will more likely renew it two more times since they are a medical student enrolled in a 3-year program.  

Make the code the last four digits of the guests phone number and delete it after checkout.Pay attention to the details.