stayed 2 nights with 4 friends, we've been given a 6-beds dorm all for us: the room was clean, comfortable, with safe lockers and air conditioning; bathroom are clean, with everything you may need.
the hostel's position is great - <10 min. walking from the city center - though Calle Predicadores isn't the most beautiful street of Zaragoza; staff is very kind and helpful (both during day & night), except the guy at the reception on sunday morning... and some draught beer is always available at the hall at reasonable price! internet works good, for real and for free, the common rooms are nice and comfortable, also with some "artistic" touch.
special mention for the inside architecture: parts of the ancient building are incorporated into the whole structure!

+ : about everything
- : street is a bit noisy, if you need to sleep long in the morning... more