It just happened to night guests arrived at Friday night 2AM, who had reserved for Saturday night, asking the permission to arrive between 12PM and 1AM. On which I agreed. They sustained that they were comunicating to me that they would arrive on Friday night, which was for them Saturday night. Their request: "However our flight does not land until 12pm on the 9th of October and we were hoping to check in our bags that night at around 1am/12,30pm! We would be extremely grateful if you could help us put on that front! Grazie, " and reservation starting on Saturday. When they arrived I made clear to them that they were lucking I could help them out, as I had no reservation for that night. As they only contact when they were already on their way to the apartment, all preparations had to be done under great pressure, and only after realized myself that I checked them in without a mask. Which I normally would have taken care of. I made clear to them that they were lucky as I had no other reservation for that night and that it would be the case to pay one night more. They did not understand, insisting that our agreement was for an arrival on Friday night. What should I do?