The Depreciation report should give you a good idea of when and how much money is supposed to be spent on replacing aged building components such as roof, elevator, exterior painting, HVAC/MUA, etc. and what year to expect to see that project coming up.   

If someone complains about there being too many stairs and no elevator, and the owner points out that the ad states "the apartment is on the third floor and there is no elevator", it explains the bad review is irrelevant. 

Private accommodations of Airbnbs will feel much safer than hotels designed for the masses that increase the chance of bumping into an invected person at the turn of every corner or opening of the elevator door.

Seems like people are paranoid to stay at hotels and use elevators! 

But I'm afraid of too picky inspections and that I'll need to remove all walls, ceiling and floor (basement has kind of inside crawl space - elevated floors for plumbing I guess)I'll do some apparent work anyways: add vents for bathroom/dryer/microwave, insulate and enclose the furnace (at least from thr bedroom), check for gfci/arc breakers, may be put resilient channels and more drywall to reduce noises from main floor.. also - add heating.. etc.Does someone have experience permitting someone's work? 

I ordered an elevation certificate.

I realized that I didn't belong in an environment where people would be standing at the elevator at 5 PM sharp regardless of what they were in the middle of.

Hopefully you have consulted a US CPA and a counterpart in Australia, and they've green lit a US SMLLC directly owned by you as the optimal structure, and you've run an ROI calc and taken into consideration these elevated professional fees. 

For example, do students have to take an elevator to get to their floor - how do we ensure social distancing practices for lots of students trying to take an elevator?

Hotels have shared hall, elevators, lobbies, parking lots, etc and much more likely to come into direct contact with other individuals or groups.