The Weltrestaurant is located just next to the Markthalle 9 market in Kreuzberg. The food there is mainly German, though I had once a delicious Black Angus steak, it was not cheap but it was worth every cent! The Schnitzel there are also enormous, the plate is too small for it to fit in completely. You can also have some game here, I haven’t tried it yet but some friends did and it was tasty they said.
The staff is quite friendly, the prices are fair, the location is great if you wanna have a good meal after visiting the market nearby.