Hi @Nicola242
I'm no lawyer but under the impression that if you use airbnb you are agreeing to its T&Cs
Did you pay a security deposit, I can't see one on the listing you booked.
You can make a counter offer or deny liability and the host will escalate to the resolution centre. The host has 3 options 1/ claim from the guest, 2/ claim on airbnb host insurance, 3/ claim on house insurance.
Airbnb will mediate on your behalf and their decision is final, without before photo's it could have been the previous guests and airbnb will probably kick out the claim, even if they uphold the claim it would only be for the value of the goods on todays secondhand market.
Read this Your-top-questions-about-Host-Guarantee