@Jill862 Close the calendar to future bookings. It's a big hassle both for you and the guests if you end up having to cancel future bookings. Since the listing and bookings can't be transferred to the new owner, even if he wants to use it as an Airbnb, there's really no advantage to continuing to accept bookings, except for wringing every possible penny out of it in case you don't get a buyer and sale closing for awhile.
But if it sells quickly, you'd have to cancel the bookings, which isn't really fair to the guests.
And when it's on the market, that means you'd have to have showings to prospective buyers, which you really can't do if there are guests in residence.