I had a reservation starting on the 9th. A week before, I added and paid for an additional night of the 8th. As fate would have it, my flight was cancelled and I ended-up not needing the 8th after all, and arrived on the 9th.
I was able to inform the host on the 8th that I would be arriving on the 9th, but the system prevented me from changing the reservation date.
On the 8th, I put in a request for a refund of the one night.
The host has not responded, despite having made contact through the AirBnB site as well as WhatsApp. I pressed the button to "involve AirBnB", then they opened and closed the case so fast that I couldn't possibly done anything! Really? I don't check my email every minute, waiting to answer a question (that is probably already documented anyway).
It would seem to me that someone from AirBnB would take ownership and get the host to respond. I requested a refund for one night, and getting that refund is obviously is my goal, but really, at minimum, I'd like to have the host to at least acknowledge that I got one fewer nights than I paid for.
Just now I got off the phone with AirBnB support and they made no guarantees that I'll get the refund (pounded that point hard), but said that they'd "try to get the host to respond". Heh, well, that doesn't sound to promising. I'll try to follow up after this thing progresses.