Had an amazing stay in Berlin with 13 of us altogether, I thought it might be a bit cosy but this place housed us pretty comfortably (with a couple of people on sofas). The basement was a great feature, perfect for late night tunes and pool sessions - and the kitchen table was large enough to eat as a whole group on a couple of nights. Alex very helpfully left us four sets of keys as well as allowing us to collect our bags later on our last day when we had a late flight.

All in all, highly recommended for a group of friends - the area has some nice little bars and restaurants (I'd suggest Nemo, about 10 mins walk away, for pints and smoky pub vibes, if you're into that sort of thing)