Let's at least get the name of the company right, it's Airbnb.  Then let's not say that it is involved in "leases," or even "rentals," at least in the sense that Hilton or Marriott "rent" real estate.  Generally, Airbnb people stay a few days, or maybe a week, and then the place is cleaned up so that the next "guest" can use the property of the "host" for a short stay.  This would go on a Schedule C, if an S corporation were not involved.  

By omitting the detail from your posts, I assume you are telling us that he hires someone else to come in and clean the toilets and make the beds between stays.  I think he's still running a business, not managing a rental. And that answers your questions.