I had a very nice stay at Crafoord. The communication was very easy - eg late check-in is no problem. The hostel is super clean. There are not too many rooms which makes it very cozy.
The moment I stayed there were not too many guests - I can imagine that it can be pretty busy in the small kitchen - plus there is no stove.
The staff was very nice and helpful with local information. I liked the fact a lot that you had to take off shoes before you entered the hostel.