You will have to hope that the person who receiived the payment sends it back. Or, that the details you provided were not a valid account so that the money will be returned in due course from wherever it ends up. Banks usually return money that is sent to them incorrectly addressed pretty quickly (in most European countries, within a couple of days). Contact AirBnB and see what they can do to help, but their hands are tied until the money is returned as you entered the payout details.