Serbian language is a Slavic language, of the South Slavic branch. It is officially used in Serbia and in parts of Bosnia & Herzegovina (in Serbian federal unit called "Republika Srpska"). It is recognized as the minority language in Montenegro, Croatia, FYR Macedonia, and Romania. There are an estimated 12 million people speaking Serbian all over the world.
You find yourself at Terazije square, near the fountain, asking yourself what to do or see next. Well, very few people will advise you to go and see a nonexistent tavern in an unattractive house that barely stands. If anything, at least it is pretty close.