Small Studio/Apartment with space for an upright piano in Köln

I am going to be a student of HFMT Köln, i'm looking for a Small Studio or Apartment with enough space for an upright piano (it would be a "Silent" piano which means I can also use it with headphones so it doesn't bother the neighbors). I would need to be able to register (Anmeldung) there. I am also open to sharing a flat, as long as I can have those two things. My plan is to stay from October 2026 to at least until July 2027, with the possibility to extend one more year. If it's possible to visit the apartment before to have a look on the size of the bedroom for the piano, better.