In reply to Jimbo MSider:
The Refugio is a great place to stay, so long as you don't expect anything more sophisticated than a camping barn.
It's spacious, has plenty of seating downstairs and an indoor cooking area (its best to bring your own stove etc) and there's a small stove for burning firewood that chucks out some serious heat when it's going (nice when it goes cold at night). Upstairs is a large comunal sleeping area with matresses (you need to bring a sleeping bag). Toilets are basic but OK, and washing /showers are good. In the past I have camped, and used the refugio in the evenings (candles provide adequate light and add to the atmosphere) and to sleep when it rains!
The best things about the Refugio are its location - 50 yards from the climbing, beautiful and quiet location - you'd never know you were 15kms from Benedorm, and the international mix of climbers staying there.
Just a note - camping is officially not allowed within the park, but a limited amount is tolerated by the Refugio - just be prepared to move your tent to where the rangers tell you is OK, even if you can't understand why it makes any difference.
Finally, the Refugio was set up by a couple of local guys who put up a great many of the routes around here and were responsible for much of the development of Sella - so its nice to give something back...