Yes, most hotel room reservations are refundable provided that you cancel prior to the accommodation's cancellation deadline, which often is within 24-48 hours of your check-in date. If you have a non-refundable reservation, it might still be possible to cancel it and be given 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 near Moskvarium.