In reply to bobjohnston:
Yes it opened on the 13th June. I stayed there last week but unfortunately had the same problem as you - tried the gardienne's mobile number but it kept saying it wasn't recognised?
I can't really be of much help other than to say that we just walked up there without a reservation and asked if we could have a bed. They were very obliging. It'd probably be a bit more tricky if you're after food etc.