Singer109 is one of those hostels I want to come back if I'm happen to be in Berlin. I stayed there twice and it's always been great. It is a hostel, though despite sharing room thing it is a mini hotel:) i like it a lot! Especially that the bar was waay on the first floor and doesn't really affects the sleeping area. The staff was most helpful and kind. And the place is few blocks from AlexanderPlatz and very close to train station. Totally recommend it!