@Dana273
This is really simple....
If a guest cancels you receive a payment aligned to your cancellation policy. And you calendar is re-opened for those cancelled dates. You can price this however you wish. My view is that with such lovely properties they would be in high demand and even a few weeks out you would get bookings at your normal rate.
The only excpetion to the above is if there are extenuating circumstances and AirBnB decides the guest should receive a full refund. You will not be told what the extenuating circumstances are (it could be anything from a death, to serious illness to bad weather etc). In that case you would probably receive nothing but your calendar would be open for bookings.
People generally don't cancel holidays and risk losing 50% of what they have paid without a very valid reason.
Good luck