Oh dear, our German studies are getting the better of us. Never mind, a walk up the Kollwitstrsrasse is today something very pleasurable and even inspiring at least as far as the visitor is concerned. There are plenty of wine merchants as wells as wine bars, Delicatessen, Restaurants, Cafes etc. Also, an international feel with Hispanic and Italian places and around the corner, a couple of Russian ones.
The Wine merchants include Weinladen Schmidt
These include a heartening diverse selection. Here's just the Red Greek department