I'd give the beer a miss... it's terrible
Have to agree with the other posters on this one. Kolsch is a world classic beer and I would recommend PJ Fruh
Cölner Hofbräu P. Josef Früh KG
Am Hof 12-18
50667 Köln
Best description is like a top english bitter but served chilled. This works as the beer comes straight from the barrel and is served in small glasses, which are regularly swapped full for empty by the table waiters. Typically the waiters just keep a tally on your beermat and you settle up at the end of the session.
The old town and the river are also worth a look around, as is the surrounding area.