One who staffs an office with regular hours, does showings, accepts rent payments, and does tenant relations.  

You will also be turning these rooms when people leave (washing the sheets, scrubbing down the shower, vacuuming, etc.)Granted, this is if you are aiming for 5 star reviews (I don't know any other way).

Hi Jessica, Easily the first question I would ask them is if they work with investors on a regular basis, not just a one off here and there.  

We plan to repeat this so just looking for a regular process we can follow. 

Now we're thinking about our next investment, basically looking for opportunities, either for AirBnb or regular rentals (considering condos / duplexes right now)

Some of the areas where that will cause investors to become frustrated are regular reporting, timely delivery of payments, accurate and transparent financials, timely delivery of tax documents, and the ability to meet target projections related to timing and returns. 

Also, when do the home inspector's hired by the bank typically stop their regular check-ins after the property is sold?

Require adequate notice, advertise before the vacancy, preferably 2 months ahead, and ramp up your advertising.Assuming you do regular inspections to insure your units are maintained in good condition and allow tenants a smooth move out you implement a plan where by they assist you with showings while they are still in the unit.

I know there are people who have the money but don't want to really put in the time and effort to go to the property regularly, oversee the work, etc.

Did you start a separate entity for the REIA or is it run out of your regular LLC?