We stayed four girls in a classic miniloft and found that it was more than spacious enough for the four of us, and excellent value compared to staying at a hotel. Close to public transport, Friedrichstrasse and Spree river. The owners/staff keep out of your way, but are super helpful if you need anything, like fresh towels. The complimentary guidebook is great help, and staying over New Years Eve, we were even given a complimentary bottle of bubbly to add to the celebration! I'll be staying here again next time I go to Berlin.