As of February 2016 guided visit is 5 euro per person.
The tour starts from very beautiful collection of tapestry and various bishops' clothes. Then there is a room with huge religious books (mainly 16th century); another room with small art collection (wood carvings and paintings). Tour proceeds to impressive sacrestia (described by the guide as "regna" of Spanish sacrestias).
The final part of the tour is lead by a monk, who starts from inspirational speech (as I partly was able to understand it) and then finally rotates a special niche and you could kiss some relic from monk's hands and glance closely at the statue of Madonna.
In overall, we liked the monastery, which seem to be very popular amount local Spanich pilgrims even out of tourist season.