@Sean45
Hi Sean, you no doubt know the cancellation rules but I will include the relevant clause here.
The guest is required to pay you for 30 days from the date of cancellation, or until the end of the scheduled stay and this is to stop guests from using the scanario you have described where there is a discount involved.
So your payout from this stay will be honoured by Airbnb and, it is up to you whether you point that out to the guest.
You can explain to the guest that the cancellation was something that they requested, not you and on that basis if Airbnb handles the cancellation, the rules state that the guest is not eligible for a refund and would not be paid one.
So, what I am reading here Sean, is the guest expects a return of $1,730 for a stay that they have paid $1,072....that is $1730 less the 38% additional discount that they got.....is that right?
You can say you are prepared to meet the guest and refund a portion of the unused nights baring in mind the discount rate for the 20 days stay was more than 50% less than the discount rate paid for the 33 nights.
The other thing you need to consider Sean, the guest has already paid for 27 nights and is highly unlikely to honour a payment for the remaining 6 nights of a reservation the guest has cancelled! It is highly probably that when Airbnb go to claim the remaining balance in 7 days time, they will find the funds unavailable!
So any offer you make will need to wait and see if the guest honours the next payment!
If they do not make the next payment I would offer the guest half of the remaining 7 nights up to the 27 they have paid for at the discount rate they paid.....ie $107.20 x 3.5 = .....$375.20!......Take it or leave it.
Sean, I am not sure of the figures here but from what you have described this would be my offer to the guest and I feel it is a reasonable one...but, it's your call mate.
Cheers......Rob