Lovely guests - good communication, no complaints whatsoever! Prior to moving in, Guest requested a change from 17 (or 18) days to 13 days even though the reservation had been made quite some time in advance. I accepted the change mentioning that it would be good to make the change before moving in which would trigger pay-out by Airbnb to my account. Done. Now Guest and family have been here for 12 nights, the appreciated pay-out has been on my account for a while, and the Guest requests a reservation change. He would like to move out tomorrow (9/12/16); today is 9/11/16; told me yesterday on 9/10/16. I believe this is no longer a change in reservation, rather a refund or partial refund.
I've looked at my choices entered earlier this year, I believe (although right now, I can not find them again on the site), and having chosen the 'Moderate' cancellation policy, I note that the Guest, with Host's agreement, can expect a partial refund, i.e. 50% of nights not spent starting at 24 hours after acceptation by Guest (therefore, Host, as well). I have not accepted the request yet.
But the Guest proposed a change in RESERVATION posted by Airbnb lowering the already paid-out sum from USD 2838 to USD 1980.
I told him that I would have great difficulty reimbursing this sum and that I would look for guidance on the Airbnb site. At the rate of $218.31/night (2939/13 = $218.31 - payout amount), or $858 / 5 = $171.60/night (calculation of pay-out difference divided by the number of nights spent), shouldn't I have to refune 50% of that sum if I accept and not the entire 5-day cost?
How can I be sure to reimburse the 50% amount and not the entirety?
I note: the reason for the shortened stay has to do with the Guests' good fortune and not any complaints on either side. Guests' belongings are still in the space and Guest has the keys (9/11/16). Many thanks in advance for your help.