I've had a lot of pizzas and this compares with some of the best.
Pizzeria Piccola is located north-west of the center of town. It is a short bike ride, with good bike parking available, and conveniently located next to a bike shop.
You order at the counter, but make sure you look at the two chalk boards flanking the front door. Pizza and pasta specials may trying to call out to you. I ordered the Pizza Bufalina and it was great. The sauce was very well seasoned with fresh mozzarella di bufala. The crust was not too thin, had a good chewiness to it, but still had some crunch.
Will definitely go back the next time in Köln.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.