Carsten's home was beautiful. It's spacious, clean, and has an amazing terrace overlooking Schoenberg. It was in a great location, walking distance (less than 5 minutes) to both the U Bahn and S Bahn stations. Both of which can take you to the famous hot spots in Berlin - Brandenburger Gate, Alexanderplatz, etc.
My wife and I work out every morning. So for those who are looking to get a sweat in before they get their day going there is a FitX right down the street from his apartment. They have a free two day passes - which was great since we only stayed in Berlin for three days.
Carsten was quick to respond from start to finish, had tips on where to eat, and offered to help out with anything else related to getting the most out of our experience in Berlin. I would definitely recommend staying at his place again.