I live in the district of Friedenau with my Polish and Welsh roomates. This flat is an awesome place because of the nice atmosphere we have here. We enjoy eating together, watching films and a casual beer
My room is 25 square metres with additional balcony. Good working environment due to a nice Sofa, computer desk and lots of natural light.
I also own a bike that I can lend if someone is interested, as well as a lot of GYM equipment, in case you want to workout a little bit while in Berlin :)