At check in time, the property management company did not know the location of the keys, and had not finished cleaning the property. They asked for more time, but could not sort it out. We had to open an AirBNB support case to request a refund. AirBNB asked us to give them more time to sort it out, which we did, but by 7pm on check in day it was still not sorted and there were no keys. Ultimately AirBNB support refunded us and provided a credit for our missed stay.
We had to book last minute hotel rooms in Paris. This was hugely inconvenient and expensive, and cost us our first day in Paris on holiday, to negotiate with the management company, with AirBNB, visits to the key management service who did not have the keys, and to move to a hotel late that night.