We had a great stay at the apartment. Our flight was delay and Mr. Guerrini was waiting for us very patiently to hand us the keys. He was really kind and welcoming. The flat is as described in the add. We found it in an impeccable condition. It is very light and spacious and it is newly refurbished. Our babies loved it and so did we. The street is really quiet and the area is great. One can reach Berlin Mitte in 20 minutes using public transport.
The only issue we had was the noise with a neighbor partying on Friday night until passed midnight. The music as well as the conversations we could hear were very loud and really disturbing. This is unfortunately not ideal if you are out and about all day and want an early night with your kids. We believe they were coming from the flat next to ours. Also on Saturday night someone upstairs was kind of exercising and stepping loudly above the bedroom. Although it didn't last very long, it was long enough to annoy us.
Otherwise, this is a great base to visit Berlin. Beautiful apartment in a beautiful area.