You can order the permit here : www.environnement.public.lu/guichet_virtuel/escalade/index.html . 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!)
This is an excellent faceclimb, following thin flakes and short lieback cracks. The exhilarating finish is very fun!
Location
Walk past the wall of Arete Paulette, scramble up left after the chimney. Go past the wall, heading up (past the edge) towards a super small but distinct gully.The route starts 10 feet before the gully