There is outdoor seating directly across the plaza from the main entrance to the Colonge Train Station. As it was August, and warm, we chose this rather than going inside. We were quickly served and had the daily specials--currywurst for me and a asian chili chicken dish for my wife. Good food, and they serve the local beer, Kolsch. Since you are so near to the station, I would keep my eye on your belongings, but it was a good spot for a quick tasty meal. There are better places in Colonge, but this hit the spot and we were glad we ate there as we did not have a lot of time between tours. The view of the cathedral is nice, but this directly next to the transportation hub of a major city and the plaza is noisy and can be crowded. Good if you like people watxching, though. You will see a variety!