We didn't stay in the hostel as it was fully booked, but visited the bar on 2 occasions and had a very enjoyable time. The staff were very friendly (especially the guy from Harrogate) and the music and atmosphere were excellent.
Although we were the oldest customers by about 30 years we didn't feel out of place.
When we go back to Amsterdam we will try to stay here.
Also, check out the photo of the men's urinal!