With 20 years experience managing my sfr and as a property manager for a broker and a bank, this switch into ABNB has been a learning experience.  

The picture they have on Zillow vs one of the several I have with the same view:I don't know who your current PMC is, but I had to switch from my initial one in Warren, MI as it was taking too long to get a renter placed. 

Now, I see you are in Seattle, which much like Portland, has extensive tenant protections.

A well written management contract should clearly spell out what is expected of both the PMC and the owner, to PROTECT both and avoid misunderstandings.

To protect our rights, we would definitely deliver a formal 5 day notice (Wisconsin Legal Blank), but at the same time indicate that we are looking to collaborate to find a solution.

You have to protect your assets and your family.Yes to all over 18 years old.

If I was the buyer's broker, I would have checked myself to protect my client.If they had, then they would have found out it was not a three family.

Should you switch to a different minimum per night stay?

Handle this promptly to protect the owner’s interests.

Work with a real estate attorney to draft a formal agreement that outlines responsibilities and protects both parties.