There is a great tool enabling you to have a minimum of 3 nights, say, but override it to 1 night for selected dates such as short vacancies of unsold nights coming up.
Unfortunately there is a bug in the program which automatically sets the start day for such bookings as Sunday "booking must begin on a Sunday". You need to monitor your Availability Settings to make sure that the start day override is not set. I have no idea who in Airbnb to report this to but if anyone is listening can you please check this out. It is losing us and you business.