Room for the winter semester

I am an exchange student that will attend the course of Music Teacher Training in the university of Künste during the winter semester.
I am Portuguese but I can speak English and I'm learning to speak in German too.

Besides my course I am a jazz singer and I have played classic piano for ten years.
One of my goals is to get lessens of jazz piano during my staying at Berlin.

I'm looking for a room in the districts of Kreuzberg, Charlottenburg or Neukölln preferably near the subway.

I would like to live with roommates that are musicians too so we can help and learn with each other.