Yes, most hotel bookings are fully refundable as long as you cancel before the hotel's cancellation deadline, which is often 24 or 48 hours before check in. If you have a reservation that's non-refundable, it might still be possible to cancel it and get a refund within a 24-hour period of booking. Plug in your dates, click on "Search", then you can use the "fully refundable" filter to get the best deals available near Casa da Cultura.