Ben is honestly the best host you could wish to get for your stay in Berlin. We stayed for the week end, checking-in was very easy with the great Electronic system in place.
Ben is easy going, and you will really feel at home.
All the little touches from Ben through the week-end made our stay unforgetable, and it was a pleasure just to sit in the morning and have a good breakfast !
all in all, you won't regret it :)