One of the conveniences of Berlin city life is the Späti or Spätkauf, the local convenience store. It’s like your corner bodega in New York, a little market that sells essentials and is nearby and open late. Beer, newspapers, fresh baked goods, condoms, a couple of cooked meals, some minimal groceries. There’s one on nearly every block.
It’s particularly useful in Germany because laws and customs strictly limit how late stores can be open. For instance almost no one is open on Sundays, including grocery stores, without special exceptions. But somehow the neighborhood Späti is open every day, often 6am to 11pm or some even longer. The name literally means "late store".
In nice weather the Späti often have a couple of tables outside. And there’s no rule against drinking beer outside so they become a low cost alternative to going to a bar. There’s even Späticrawls where people spend the evening wandering between their favorite Spätis drinking beer on the way.
One other handy thing about the Späti, they often double as a formal package receiving service. My local has a deal with Hermes where a package can be delivered to them and they’ll hold it for a week. Fairly serious system for pickups too, an ID check and a signature and a record made. Amazon is happy to deliver to these so it’s easy to buy things from them in Berlin.