Please refund the guest in full

My villa was badly affected by the recent flooding in Murcia and I have taken it off for bookings until at least the end of October. Unfortunately because I have had no Wifi and a guest booked for today and has made a payment and the house can not be lived in, so how can she get a full refund please. The booking was was under *** . 

Thank you and so sorry for the inconvienience.

Lesley McAuslin