The only three options I was aware of have been mentioned, El Altico, La Muela and Casa Serena. We got lucky at the refugio, only ones there and a room to ourselves for most of our stay. Agree that the cooking situation would quickly get difficult if it was busy. It did occur to me that it might be an option with a hire car to stay in a cheap hotel somewhere off the motorway towards Valencia (if there is one) and commute to the crag, but I guess you would missing out on the village, the general vibe, walking to the crag etc. And spending a lot on fuel of course.