With Mitte, Prenzlauerberg and Kreuzberg all vying for which neighborhood is the coolest and Friedrichhain trailing closely behind, it's easy to forget about Schöneberg. This is truly a shame for any vintage lover because they might have never heard of Goltzstrasse. Not only does the street have Mimi Textile Antiqitäten (Goltzstrasse 5), a shop which is the place in Berlin for antique vintage clothing and accessories from the 20s to the 40s, it also has the wonderfully retro Cafe Sorgenfrei.
Cafe Sorgenfrei (Goltzstrasse 18), run by a native Berliner and someone from the Pfalzer region, is done completely in the style of the 50s and 60s right down the doilies on the tables. The menu is also filled with all sorts of "old school" goodies like Hawaii toast and banana milk. Some of the vintage knick knacks and furniture is also for sale, so make sure you come with some extra bills tucked into your kid gloves.
On their website you can also see lots of nice vintage photographs such as the one below of the Fleischerei (Butcher shop) that was there in the actual 50s and 60s. Come by for some Kaffee und Kuchen anytime between 12 and 7 on Tuesday through Friday or for a little weekend jaunt (Saturday 10 to 6, Sunday 1 to 6).