Yes, the majority of hotel room reservations are fully refundable provided that you cancel before the hotel's cancellation deadline, which is usually within 24-48 hours of check in. If you booked a non-refundable reservation, you might be able to still cancel and be given a refund within 24 hours of booking. Enter dates in and click on "Search", then filter by "fully refundable" to review the best deals available near Planetario Johannes Kepler.