Possibly my favorite Brauhaus in Cologne. Brauhaus Pütz is very small and "urig"1, the Köbes2 is quick and attentive. They serve Mühlen Kölsch3 which many consider to be the best one. The food you get is the traditional Cologne Brauhaus fare.
1 rustic
2 the waiter that brings you your Kölsch
3 https://muehlenkoelsch.de/