Yes, most room reservations are refundable if you cancel prior to the accommodation's cancellation deadline, which is often 24 or 48 hours before your arrival date. If you have a reservation that's non-refundable, it might still be possible to cancel it and receive a refund within 24 hours of booking. Plug in your dates, click on "Search", then you can use the "fully refundable" filter to review top deals close to Mannerheim Line.