Pizza and more
Why locals love it
It's a cozy place with a fantastic interior (in summer you can sit outside in the sun next to a big park - traffic is very low), nice music, lots of food and (homemade) dessert to choose from. They offer a broad variety of meals, many vegetarian or even vegan possible. It can be crawling with moms and their offsprings during lunch time though.
Why you should visit it
My favorite is the German pizza clone "Flammkuchen", one of the only places I know that serve it made of spelt or wheat. No price difference which is very fair. You can choose lots of different toppings. Also their daily soups are fantastic. They also serve good smoothies and fresh juices.
It's a very nice place to have a break in and the surrounding neighborhood is great - some hostels around too!