Yes, you'll find most hotel reservations are fully refundable as long as you cancel before the accommodation's cancellation deadline, which in most cases is within 24 or 48 hours of the scheduled arrival. If you have a reservation that's non-refundable, you might be able to cancel it and get a refund within a 24-hour period of booking. Add your dates and click on "Search", then use the filter option "fully refundable" to get the best deals available near Getulio Vargas Square.