Yes, most room reservations are fully refundable as long as you cancel prior to the accommodation's cancellation deadline, which in most cases is within 24 or 48 hours of your check-in date. If you have a reservation that's non-refundable, you might be able to still cancel and get a refund within a 24-hour period of your booking. Plug in your dates, click on "Search", then you can use the "fully refundable" filter to review the best deals available in Caixa d'Água.