I booked a room for a month-long stay several weeks in advance. Then, the day before I was due to check in, I was told the house was going to be renovated and asked if I would be ok with being switched to the basement. I was not ok with that so the host gave me a full refund and Airbnb helped me find a suitable alternative housing at the last minute. I thought the host's request was completely inappropriate and unreasonable, but things worked out fine for me in the end.