I can't say anything bad about Björn or his apartment. It's right on the famous Kastanienalle in Prenzlauerberg, a very hip street full of restaurants and bars. Some highlights about the location - there's Pratergarten two doors down (an outdoor beer garden with awesome beer and German food), the Eberswalder U-ban is at the end of the block, and Mauerpark and Volkspark are less than a 5 minute walk away. Despite being in such a great location, the apartment itself is located in the back of the building sheltered from all the noise from the streets. The apartment is also not a typical German apartment - in fact, it's much more of a Scandinavian style - very spacious, clean, and extremely modern. Björn was very responsive and it was really easy to get a hold of him - he works (or owns?) the bar right next door. I'd love to stay in his listing again on my next trip to Berlin if it's available. Thanks Björn!!