I often go to the movies at the Cinestar of Sony Center at Potsdamer Platz, once before the film, we went for a drink at Billy Wilder, just a few meters away from the theater.
The design is quite classy, there’s a big bar around which we can seat on the 3 sides, we could almost steal the bottles. ^^ The staff is friendly and the cocktails really excellent! They also do some food but I haven’t tried it yet. And as we can expect in this area, it’s somewhat pricy but worth it once in a while.