Nice apartment with plenty of space close to Checkpoint Charlie. Area is quiet, seems to be a lot of offices which means quite a few places for lunch nearby, there's a Späti about 5-10 minutes walking from the apartment.
Communications are good, close to the bus stop going to Alexanderplatz or Oranienplatz where there's lots of places for food and drinks.
Overall a good stay, would recommend especially if you're looking for a quieter place.