flat/room for rent from December

I am looking for a small flat or a room in Köln, located near good transport connections as I will commute to Bonn for work.
Ideally, it should be available from December onward and be furnished. I am also happy to take over a flat or subletting it, in case you are leaving for a period of time.
Something about myself: I am from Italy, but have lived in many places across continents. I am very tidy, I enjoy cleanliness and appreciate well-organised and good-looking spaces. I also plan to travel quite a bit and take advantage of living in a city. Unfortunately I still don't speak German, but I am willing to learn as soon as I figure out my housing situation.