In reply to Cheshire Dave:
We camped which was fine. The Refugio was rammed with a school party for the whole week and I suspect that it would have been horrible to stay there. However, the bar has rooms. We met a couple staying there last year and I think they paid about £30 a night for 2 - this may have included breakfast, so a pretty good deal. Plus the bar is cool and is run by some very friendly folk. ,