Joulia S.
Yelp
You can smell the perfume of coffee roasting from outside, before seeing the place. It's slightly off hand for Cologne, close to the edges, so probably not a place a tourist would willingly venture to. Yet the coffee is excellent and the price is fair. I especially like their well-made capuccino (even with soy milk). I haven't tried many of their coffee sorts, but there is a huge selection for all machines and of all kinds (I bought Espresso Napolitano). One can find their coffee in several places in the city. Go if you're a true coffee fan, or if, like me, you spent some time in Italy and miss a good cup.
(There is also coffee to go and they sell reusable cups with a free refill. Clearly not a place for working especially when the roasting machine is on, but it has a nice coffeechurchcult kind of atmosphere.)