I agree with John's assessment of Benduenos. It is a fantastic albergue. Its location isn't ideal but everything else about it is. You can either walk a very short day from Pajares (about 14 km I think) or walk a long day from Poladura (around 30).
The albergue is about 2.5 km off-Camino. There is a very clear marking in the hamlet of Herias, showing you where to turn left to head up hill (and I do mean UP). The next morning, I retraced my steps down to Herias, though there is a turn-off showing a path to Campomanes from outside Benduenos. It wasn't totally clear to me which path of two to take, so I just went back to Herias. If anyone more adventurous stays there, it would be a good service to other pilgrims if someone would figure out which of the paths goes down to Campomane and report back. That would save a few kms on the walk the next day to Mieres.
And btw, if you stay at Benduenos, you are just about 90 mins from the church at Santa Cristina, a NOT TO BE MISSED visit. The woman in charge of opening it lives nearby, and though the visiting hours on the door have an 11 am opening time, she will come up for pilgrims if she is around. I called at about 9:15 and she was happy to come up.