I have a very similar situation 11 months later. AirBnB does not have guests' backs at all.
I have a guest in my apartment who is mad at me for no fault of my own. He expected to wait 4 weeks for a visa and the embassy came back and delivered it within 1 week. I must be one of the rare folks who is being abused because of a bureaucracy working too efficiently.
He, too, has full access to all my possessions, including a fortune in vintage and custom furnishings. I do not have anything from him except a few weeks of rent payment. No security deposit, zero warranty from AirBnB for my home, nothing.
Just a few years ago, a young, jet-setting couple rented for 3 months and snuck in a giant poodle two days after arrival, which is against my listing, my health, my lease, and the Building rules. AirBnB did nothing but let them hide behind suddenly claiming the poodle was an emotional-support poodle with zero documentation. They then proceeded to utterly trash my place, had their poodle sleep on my red silk vintage couch, which I begged them not to, just to spite me. They had dog food and treats everywhere, and by the time they left the apartment was infested with mice and cockroaches. It costs me thousands of dollars to remedy and a terrible review from the guest who came in the next day after they left but before we discovered the level of hidden damage.
They also left a drug-laced (psilocybin) chocolate bar that one of the cleaners ate (stupidly, but it was beautifully packaged, and he plucked it out before we threw everything away); he ended up in the ER of Lenox Hill hospital with low thousands in medical bills. The floors were covered with clothing they'd thrown away; the garbage was overflowing on the kitchen floor; and my team had never seen anything like it.
AirBnB did nothing; they didn't even publish my review. I complained multiple times, offered documentation for everything. Totally ignored.
Then months later, I started getting bank statements that the couple had overdrawn accounts by tens of thousand of dollars and used my address.
When I reported this to AirBnB, AirBnB said that I should not be opening their mail!!
I couldn't write a story like this if I tried.