We wanted to stay there for 2 weeks (late August-early September). Gico has been nice giving us some information about the place which sits in a marvelous area.
Though you should know that it’s really not easy to get there: 1. The minibus that carry people to the last village works only if the weather is good (and it can be extremely rainy), envisage an extra 45mn steep walk. 2. If you are loaded with backpacks it is quite physical to get to the cabin.
Consider the weather. It has been extremely rainy half of the time and we had really cold nights (sometimes around 0°C). Be sure you have enough food because when rain happens you can’t go to Vilminore (or anywhere).
Know that the place is not really private. It figures on all the hiking maps like some kind of refuge and people stop by when the weather is good. The people we met were generally nice, but it’s still awkward to wake up because someone tries to open your door at 8. We once found leftovers of chewed sandwiches which was a little less nice.
We finally stayed less than booked mainly because of the weather. The surroundings (forest, mountains) are extremely beautiful. If you like hiking it’s really nice, if you look for some kind of retreat you could be bothered by people coming by and the fact that the cabin seems to belong to the public realm.