Perched on a high ridge, this well-run HI hostel has breathtaking views over Bouillon's castle, the river and town from its terrace and breakfast room. If walking from central Bouillon there's a short-cut up a stairway from near Place St-Arnould.
Alternatively, from the bus station, follow Rue des Champs to the T-junction, turn right and wind your way up. Call ahead to check that the hostel is staffed to avoid a needless, sweaty climb.