I would like Airbnb to include a cancellation policy that says if the guest cancels and then someone else books the airbnb for the cancelled dates, the first guest gets his/her money back for as many days as the new guest is staying that overlaps with the dates they cancelled.
As a person that stays at Airbnbs and has a great deal of potential for cancelling due to circumstances beyond my control, I would appreciate something like that.
As a host I would be happy the first guests didn't get penalized because something came up suddenly.