Karsten is an amazing host!
The apartment is great for a weekend in the city, it's clean and stylish, it's not big but very spacious, great location - very close to the metro and to one of the central areas in Berlin. the neighborhood is very quiet, you need to consider that the windows of the bedroom are facing the street (it's a ground floor) - we had no problem with that, we actually enjoyed that, but it's less private unless you close the curtains.