The only purpose of the account would be to collect payments and pay bills like taxes and insurance on assets held by the LLC.

I'm surprised by some of the responses here about how people like VRBO more than AirBNB.

We affirmed the absolute rights, set forth in your State’s LLC Law, for ANY Member to request copies of the three most recent years Federal and State tax returns issued by the LLC. 

I have used him for over 5 yrs and was actually recommended by a nearby HOA President. 

The building's Property Manager is sympathetic to the owners at large, but says they can’t do anything until instructed by the Board, and they indicated the building’s lawyers would only respond to Board members.

Breaking it down by room can make the process a lot easier.There are also some great pre-made checklists in Airbnb host groups and forums if you need a starting point.

Quote from @Anne Christensen: Unless you have a ton of equity, I wouldn't bother with a legal structure that adds complexity and cost.The odds of you being sued are about the same as being struck by lightning twice.

We bought a property that we feel is assessed by the our local government too high.

The rules regarding ADU renting varies by jurisdiction. 

An LLC by itself does not change anything for taxes.