The hotel is in the middle of the centre, right next to the beautiful Sint Martinus Kerk and the Rheingarten, while also within walking distance of the Kölner Dom. I had a single person room, but i was really suprised by the size of the room. The bed was a twin bed (even though the blanket was not), and the bathroom was also a decent size (even though the door and the shower were smaller than average). the little French balcony was a nice suprise as well.
There is, however, no lift in the building. While this wasn't an issue for me, it might be difficult if you have mobility issues or a lot of heavier luggage, so that's something to take into account