This a really cool, well located apartment and a great base for exploring Berlin. The space itself is fantastic - lots of room, really good amenities (coffee, tea, Wi-fi, etc) - everything you need. Decor is fantastic - we (and particularly the children) loved all the art - really different.
It’s on an upper floor and there is no lift, but that was fine for us with bags for a short stay.
In terms of location, the area immediately around the apartment is a bit rough and ready, but really just part of the experience (and there are plenty of supermarkets, restaurants etc right on the doorstep). The U-Bahn is right outside the door as well, giving easy access to the whole city.
Altogether, this was a great base for a family trip to Berlin - we all loved it!