In reply to Fredt:
I stayed in the winter hut a couple of times last season. It's open to climbers and free to stay in, due to the main hut closed for renovation. It has around twenty beds, blankets, a fireplace, a load of logs and axe, limited pans. Plenty streams nearby, but collect water well away from the hut. The builders mostly stay in the main hut they're renovating, however occasionally overflow into the winter hut, hence can periodically get busy.