Kristen was an excellent host. She always communicated promptly and greeted us at the apartment when we arrived. The apartment is very cozy and clean. Fully conforms to the description provided. Great neighborhood, close to the city center and attractions, easy to reach by U-bahn and by bus. Plenty of restaurants and shops within short walking distance. The nearest subway station is closed for renovations until spring, but there are busses that run often to catch next U-Bahn stop, which also within walkable (about 15 min) distance.
We had great stay at Kristen's place and will definitely consider it for next visit to Berlin!