Berlin is a really beautiful and cool city and the apt in Kastanienallee is a top convenient place to stay in the city....everything you need is around the place! Björn is very cool and was a perfect host (timing, keys, friendly). The apt is absolutely great (beautiful, modern,clean) and very calm for sleeping. When you enter the builiding, you feel to be in Berlin (cool atmosphere with tags in old building) then you go in the apt and it's the modern life.
Björn has a bar and restaurant downstairs so a beer or a meal are very easy to get and his staff is very welcoming.