This place is wonderful, an impeccable space in a very quiet and safe building, a 3rd floor walk-up. It has everything you need for a perfect stay and it is exactly as pictured. Communication was excellent before and during my stay, Maria answered all my questions and the check-in was easy thanks to Olga, who helped me with my bag :)
The location is unbeatable: in the Mitte district, a few minutes away to the Museum Island (cannot miss the Pergamon, Neues & Bode) and the Friedrichstrasse station where you can get anywhere in Berlin.
Just steps away there's an amazing coffee in Albrechtstrasse (Refinery High End Coffee) and a great German restaurant called Ständige Vertretungt, right in the corner. Delicious Alsace style pizza and other traditional dishes. The supermarket is close, but for just basics the Bio Company in Friedrichstrasse worked for me.
Overall this place and the hostess were perfect!