Fritz his apartment is amazing! It's in such a good location, walking distance to many amazing restaurants, clubs, shops, cool sights and public transport. It's really in my favorite area of Berlin. The apartment has everything you need for a comfortable stay and because it's in a basement, it doesn't get too warm in winter (which is often the case in Berlin apartments). I do recommend bringing earplugs if you're a light sleeper. We slept with the windows open and the cleaning trucks in the morning are quite loud. Please don't let that prevent you from staying here though, as everything else is absolutely perfect!