We've just lost 2000 euros in the 2 similar cases that happened this week. Be ready that you can be scammed anytime and, as the host, you will not be protected by the Airbnb at all, if the guests find something cheaper and don’t feel satisfied with the amount of money they booked your place for, because most of the time there are other cheaper last-minute deals on the market, or they just want to cancel free of charge.
So, speaking shortly here's the guide on how you can possibly lose all the money on your future bookings as the host + will be left unprotected or how you can receive a full refund anytime you find something cheaper as the guest:
There are Improved protections for Hosts and guests and Rebooking and Refund Policy which literally says, that the guest is eligible for a full refund if the accommodation is not reasonably clean and sanitary, including bedding and towels. It doesn't say anything about you having the option to solve the issue or change the linen/ provide extra cleaning.
So the guest can just put his hair on the bed or mark something with lipstick on the pillow, for example, then take a photo and send it to the Airbnb and you will receive the cancelation with the full refund provided to the guest.
You won’t be given the opportunity to solve the issue, you will just receive the cancelation and be ignored by the support managers.
We have over 100 apartments, it happened to us 2 times this week with a loss which equals the 50 nights to be sold right now, since both of the bookings were on the most expensive dates in Prague (New Year's eve). The first time, we were not even contacted by the support and the guest, the second time the support manager sent us these links they are relying on, where you as the Host are not protected by Airbnb at all, so be ready this might happen to you anytime.