The host initially accused us of causing the fire through negligence, then it was eventually revealed to be an electrical fault in the building, which had been built by the homeowner himself.
The bigger problem was that they hadn’t told their insurance company they were subletting. We eventually agreed a deal with lawyers for them to compensate us. (It probably goes without saying that AirBnB was of course no help throughout the whole process.)
It occurred to me that none of this would have occurred in a regular hotel. The hotel would have a proper fire and sprinkler system with actual fire escape routes, the electrics would not be amateur and they would have had proper insurance.