You can order the permit here :environnement.public.lu/gui… . If you come from far away, you only get 1 day permits.( You might try to come without as there are almost no controls. This is not encouraged!)
The route starts very easy and goes on to a pumpy overhanging section with good holds, then comes a slab section which seems to be the hardest part. Then you top out onto a slopy ledge to clip the anchors. Really rewarding climb to do.
This is the leftmost climb in the sector Was not Was left of an aerete.