Save Up To 20% Advance Purchase Promotion Gresham Belson Hotel, Brussels. Book 21 Days in Advance and save up to 20% at Gresham Belson Hotel, Brussels. Stay for 2 nights and get a 5 % discount on your stay. Stay for 3 nights and get a 10% discount on your stay. Stay for 5 nights and get a 15% discount on your stay. Includes: Free wifi. Free Airport Shuttle Available. One child under 12 years of age stays free of charge in a room occupied by an adult. T&C: Reservation in non refundable and non changeable. Booking and staying from now to until 31st December, 2015.