Excellent location. Very nice neighbourhood (restaurants and market on Kollwitzstrasse) and very central (15 mn to walk to Alexanderplatz). Ideal for family (two nice playgrounds nearby, one when you turn left going out the building, one in Kollwitsplatz).
Charming apartment with nice furniture. Two minor problems: lack of light partly linked to the work on the building with scaffholdings (a bit noisy and starting early) and partly linked to a poor light in the apartment. The bed (1,20 m wide) is a bit small for two tall people but one can easily sleep on the coach after putting a sheet on it.
Our son enjoyed a lot playing with Casper and Jacob's toys and we definitely had a nice stay in this apartment.