Robert is very kind and disponible.
I came in Berlin late at the night, and it wasnt a problem for me to find the keys, as he left them to a bar in front of the house.
The location is the best, cause its really in the center of the “hot” berliener life, which means that sometimes you have also the possibility to just walk and not take the public transports (obv it depends on where u have to go).
I also had the pleasure to drink a warm cup of tea in the morning, which was really an appreciate thing.
Totally recommended!