If you want an authentic Serbian Friday-night experience, this wildly popular (reserve several days ahead) kafana (tavern) in Zvezdara has it all: captivating folk music, great traditional food (don't skip the mak pita – a baklava-like dessert made with poppy seeds), sexy lighting and a room full of good-time-seeking locals (and celebs) who will eventually be dancing on the tables!
It's 5.5km west of Knez Mihailova (a 300RSD or so CarGo ride from Savamala).