Location / direction:
Close to Frederiksplein stop, which runs 4, 1, 7, and 19 trams. Also close to Weesperplein metro stop. Easily accessible to and from anywhere else in Amsterdam and probably the best thing about the hostel.
Facility:
Building is a little outdated; no AC in the rooms, but it's generally raining in Amsterdam so it doesn't get too hot anyways - mosquitoes and bugs, though, could be a problem
Amenities:
Free luggage storage after check-out, as long as you pick them up before 10 pm (when the staff leaves)
Free breakfast, with toast, cereal, yogurt, milk, jam, fruits