I have explained to Maria several times that I only found out on the day that my apartment was ready; there was an electrical fault which I had been told would take at least a week to fix, however my landlord was able to sort it out earlier. If I had known any earlier that I would be leaving early, of course I would have let her know! I left a note explaining, and waited for a couple of hours for Maria after I got home from work to speak in person, but she happened to be out late that night. I had already moved some of my things because I had a lot of luggage (I'm here for 6 months) and wanted to transfer it at the weekend, so it could be in daylight and I'd have more time - I still had a week's worth of things with me. I never asked for/expected a refund so it's nice of Maria to give me one, but of course I immediately altered the booking to free up her calendar for her.
Maria was a good host while I was there but was pretty unreasonable dealing with this, as I explained several times that I hadn't been told until the last minute my flat was ready to move into.