I am not an expert on this! But I have gone through the entire process. This is what I learned:
Sadly I think there was a lot of confusion with PPP and EIDL. Most people tried going the PPP route when they should have gone with EIDL.
PPP was for businesses with employees who would get funds to spend primarily on employee wages. The businesses needed to be official businesses, with business tax returns, evidence of payroll, association with SBA approved banks, and so on. Most of us mom and pop Airbnb hosts don't really have employees nor do we have evidence of payroll through an SBA approved bank. In fact, many of us may not even have a schedule C. I'm guessing most hosts just use schedule E!
Instead, mom and pop Airbnb hosts should have turned to EIDL. With that program, you still got the $1000 grant (same as the PPP) and an option to get a non-collateralized loan at 3.75% for 30 years. I had success signing up with EIDL. I was only asked to provide my schedule E and my Airbnb 1099k.
I wish all of this information would have been better delivered both by the government and Airbnb! The issue is that Airbnb serves two types of hosts: 1) mom and pop hosts and 2) big enterprises with hundreds/thousands of listings. For the latter, PPP was good for them. For the rest, EIDL was better. I apologize that you never got help through these programs.