Bert's place is a fantastic spot to stay in Berlin. I went with a few friends and it worked out brilliantly. The flat was clean, spacious, and the street we stayed on was peaceful, safe, and lovely. The area is excellent; 10 minute walk from Berlin Ostkreuz S-Bahn station which takes you to the city centre in 12 minutes, and has an express train from Schonefeld Airport. Also only a 20 minute walk from the East Side Gallery, and close to top nightclubs such as Suicide Circus, and Watergate and Berghain. Fantastic stay.