When we arrived there was a very musty/mouse smell. So strong that we decided even though it was only one night we wouldn’t stay.
We messaged the host to say that we were leaving and finding alternative accommodation as the smell was too much for us. The host never replied to ask for more detail, see if they could help, offer a partial refund, or apologise. I was polite and hasn’t asked for anything so was disappointed at the lack of response.