Depending on which direction you are coming from, there is also a pilgrim albergue in Ena on the Camino Catalán. Fingers crossed that LTfit and I will be able to provide a first hand report on both of these albergues in the next month or so!
Just to report back, though this isn't likely to be of interest to people walking the AragonĂ©s and looking for a place to stay in order to continue walking. But on the Camino Catalán, as it gets close to San Juan there is an albergue in Ena (beautiful, newly renovated old home, with next door neighbor acting as hospitalera and providing meals if she's around). That would be about 12 km from San Juan. And there is also one further on in Botaya, about 4 km from the monastery. We stayed there -- it's albergue turĂstico/juvenil,
http://caminodesantiago.consumer.es/albergue-casa-del-herrero. Nothing special, kind of cramped in the bunk room (but since there were only two of us it didn't matter). But the best part of that stay was that the owner drove us up to the monastery in the afternoon, so we could have a full visit. Amazing place, great views from the BalcĂłn de los Pirineos. We then walked back to Botaya, which would have been less than 4 km if we had found the Camino, but we wound up on the road and it was a couple km longer, all on asphalt. The next day we left early and passed by San Juan long before it opened for a visit.
Though the ascent from Santa Cilia to San Juan may be a killer, the descent is probably the worst I've ever encountered -- slip sliding on rocks with sharp inclines, it was a real challenge. But no doubt worth every bit of patellar tendonitis I suffered from it!