I'm offering my small (13qm) but very cozy room in the heart of Kreuzberg, right at Kottbusser Tor. We live in a big (128qm) shared flat, with 4 girls.
We have a big kitchen and two bathrooms, which you would share with my roomates. Also there is a nice balcony with a super comfy couch (perfect for summer evenigs), which you are welcome to use aswell. My roomates are very relaxed and open minded people.