Hi, Thomas,
Wow, lucky you!!!
LTfit and I just walked this route. We used the Eroski site for albergues and accommodations. We were in albergues every night between Montserrat and Puente la Reina, amazing as that may seem. I just don't have the time now to put up a detailed "report" but here are our stages.
Jorba (36)
Cervera (35)
Linyola (36)
Algerri (30)
Tamarite (21)
Berbegal (40-42)
Pueyo (30)
Huesca (17)
Sarsamarcuello (40)
Botaya (30)
At this point we walked to Santa Cilia de Jaca, got a ride from a friendly man who took us to Somport, and started the ARagones in Somport. So that day we walked to Santa Cilia (about 14 I think from Botaya) and then Somport to Canfranc Estacion (about 10 more). Then our stages on the ARagones were the standard ones:
Jaca, Arres, Ruesta, Sanguesa, Monreal, Puente la REina.
Happy to answer questions. Also, we found a good way to visit the monastery of San Juan de la Pena, which I will fill you in on if you are planning on doing that. We arrived in the albergue turistico in Botaya in mid afternoon, ate lunch, showerred, etc, and then the hospitalera drove us up to the monastery. We visited it leisurely, walked all over, and then walked back to Botaya. The next morning, we arrived at San Juan very early, it was still closed, so we were glad we didn't have to sit around and wait for it to open before visiting. It's so amazing, well worth a visit.
p.s. If you are planning to walk BArcelona to Montserrat, look at LT's description. It was really rough. I think there are several alternatives. I came into Montserrat from Manresa, and my route was not bad at all. It's a very do-able one day walk from Manresa, but a hard two day walk from Barcelona. Buen camino, Laurie