Airbnb should be liable one way or another of those situations. They should at least inspect the places before accepting them in the network. They should inspect after a complaint.

I had a massive rat infestation in my Airbnb in Paris. I arrived at the place at night and I didn't see at first the forced temporary leave notice on the building door for all inhabitants. It took Airbnb 12h to respond to my emergency call. They didn't reimburse my first night, considering that I stayed and didn't allow me to review if I accepted the reimbursement of the rest of my booking. The wording was memorable "We contacted Thomas your host and he has agreed to ... ").