Yes, the majority of hotel bookings are fully refundable if you cancel prior to the hotel's cancellation deadline, which in most cases is within 24 or 48 hours of check in. If you have a non-refundable reservation, it might still be possible to cancel it and receive a refund within a 24-hour period of your booking. Enter dates in and click on "Search", then use the "fully refundable" filter to review top deals close to Plaza 25 de Mayo.