Despite its name, this is square is not a place to go fish-shopping. The area is now known mainly for its colourful buildings and an array of fine-dining restaurants you can find here.
Wikipedia https://it.wikipedia.org/wiki/Fischmarkt_(Colonia)
Address 33 Frankenwerft, Köln 50667, Germany
Coordinates 50°56'18.41" N 6°57'45.37" E