Airbnb Booking was Reserved on Another Website

I couldn’t believe that the cottage I booked on Airbnb had been booked six days earlier after I paid via PayPal on January 6th. The host messaged me after my itinerary was confirmed to tell me. She said that I could not stay in her accommodation even though I had paid and my booking was confirmed. She told me that January 8th had been booked out via booking.com on New Year’s Eve. This must be a new year’s resolution joke. You can’t place your accommodation on different websites like this. You are managing your booking details yourself. You should’ve had sufficient time to indicate “the property is unavailable ” on your Airbnb bookings. There were six days between New Year’s Eve and January 6th. You messed up your bookings and you should take responsibility. You can’t walk away after having taken money. That is called ripping people off. I have also attached my booking files to support my true personal experience with this Airbnb host and the website. I am sure that both the host and Airbnb are to blame. Both of the parties have faults. Now I am stuck.