Yes, the majority of hotel bookings are fully refundable as long as you cancel before the hotel's cancellation deadline, which is often 24 or 48 hours before the scheduled arrival. If you have a non-refundable reservation, you might still have the option to cancel and get a refund within a 24-hour period of booking. Enter dates in and click on "Search", then you can use the "fully refundable" filter to get the best deals near Stalin's Bunker Museum.