A host (call him Mark) recently described a problem, that seems to me to be an exceptionally common problem which hosts bring to the host communities to ask about. Mark said that the guest booked 4 people, but that 6 people actually arrived. He thought at first that only 4 guests would stay, as this had been the arrangement and what they paid for (and he doesn't allow more than 4 to stay at his home -- which is an entire house listing). However, the next day when he went by the house to see the guests off and check them out, he saw all 6 people inside, and as they left, he saw that they were all carrying luggage, so it was clear they had all stayed there.
Do you have any advice for Mark?