Exchange student at RWTH looking for place to live

I am studying Physics and Astronomy at Chalmers University of Technology in Gothenburg, Sweden. As part of this education I will be studying at Aachen for one semester. The studies will hopefully be in areas of theoretical physics. In Sweden I am currently living in an apartment together with my fiancé, who during my time in Aachen will be studying in Munich. Main area of interest outside of my studies is music but since I will not bring my instrument (trombone) I will probably not be playing much. I am usually satisfied spending my time reading or at my computer but can also enjoy just being with friends. I am very quiet, do not smoke and will not bring any pets. I prefer my surroundings to be reasonably clean and tidy and I am good at getting along with people around me. The dates that I want to rent the apartment are flexible.