Can't recommend this place enough if you're looking for somewhere stylish, comfy and clean to stay in Berlin.
The rooms were super stylish, clean and thoughtful, and arguably better than many hotels I've stayed in! The bathrooms were clean and people had clearly thought through what you'd need (e.g. hairdryers in all bathrooms). Having a communal kitchen with free coffee was superb, and meant that we were always comfy and caffeinated.
We also enjoyed using the living room - The ability to just chat on the sofas was a really nice facility to have available. If I had one criticism, it would be that the living room could have used 1-2 more board games (maybe Catan or Carcassonne) as we got a little bit bored just playing Backgammon and Chess!
It was also a little bit quiet so I think if you were here as a solo traveller you would be missing some of the 'buzz' that comes from more lively hostels - but as a group of friends, we enjoyed using the clubs to meet people, and just having the ability to chill out in the hostel, so we didn't miss out on anything.
Finally, I must also praise the staff, who were always friendly and helpful no matter the time of day!
Overall a superb place to stay - and comfortably deserves its rating on this site!