I was at this restaurant in August 2019. The food is for an amateur, mostly fried and fries. There is not much choice. The branded beer is good, but expensive - a 1L mug is 11 euros. You can take a walk along the banks of the Rhine in the evening, have a little snack and drink a cool foam:)
Very small rooms, narrow stairs, toilet and shower - the door opposite the room.
An atmospheric institution, not far from Cologne Cathedral, a very picturesque embankment, not far to go to a taxi (they don't come to the embankment, it seems).