Klaus's place was great! It was located in a safe and prime area, above a very good restaurant too. The garden patio is noisy but nothing ever obnoxious. Its actually makes for a very nice background noise. Its located near some great restaurants (5-10 minute walk), and a tram stop that takes you directly to Berlin Hauptbahnhof/hbf (Berlin Central Train Station). It's within walking distance to some great cafés and the "central" area - roughly 25 minutes walking to Museumsinsel (museum island) from the flat! I was able to walk 95% of the trip! The flat itself was very clean, comfortable bed, and came supplied with some extras such as towels, shower gel, hairdryer. Overall a fantastic stay, and would 100% return again! Well worth it.