Stayed twice this year, when the rate was at its lowest (about 109 euros). Booked a standard room. On my first stay, I was upgraded to Schwann's room (post 13) but one floor higher, so no walkway and a better view of the Cologne Dom (not many rooms seem to have that). The second stay got upgraded to a junior suite as in post 12 by Fransknorge. There's a noisy club on the top floor, preferably serving cocktails, but you didn't hear anything from it in the room. Lots of local youths are attracted to this club. It is supposed to be where you have dinner too, but the music is just too loud to enjoy your avocado salad. The club has an outside terrace, I would have liked to try it, but it felt a bit odd to stand there among all those summer-dressed students / young ladies on a late Sunday afternoon. Breakfast is served in the ground floor level restaurant, a very attractive setting, and pretty good options. Garden seating is available if the weather allows it. One floor is dedicated to a fitness center and sauna,
In one of Schwann's pics, you'll notice the glass roof of a public indoor and outdoor swimming pool (Öffnungszeiten - Agrippabad). I planned to try it but never got to that. Last winter the outdoor section was closed to save energy, so probably this wasn't the case in the years before, decided to try it the next time. Stayed again in June, and noticed that when I arrived around noon there weren't that many swimmers. The room wasn't ready, but could drop off my luggage. Later in the afternoon, the pool was very crowded, with lines to get in.

Overall, I was pretty happy with my stay because of the upgrades. The garage has several Diamond parking spots close to the entrance/elevator. My June visit was on a Sunday when I was able to save 24 euros by parking for 5 euros in a nearby street. That's on Sundays only, just one small section of the road on Blaubach. Fully justified from a historical perspective, because it is in front of an ancient section of the Roman city wall. I mean: parked in front of a wall that is over 2000 years old, slept in a water tower. I bet 99% of the world's population can't say that! My only regret is that I did not swim in the Agrippabad next door, named after the Roman general who was mainly responsible for the founding of "Colonia Claudia Ara Agrippinensium".