If there are any large supermarkets in Friedrichstraße, I’ve missed them. Medium and small, sure, but not large or huge — those are elsewhere in the city.
Likewise for commuting, the U-Bahn and the ironically underground S-Bahn is more reliable in that area than the surface traffic (including busses) because there’s too much surface traffic and therefore jams.
Likewise for commuting, the U-Bahn and the ironically underground S-Bahn is more reliable in that area than the surface traffic (including busses) because there’s too much surface traffic and therefore jams.