We spent a lot of time in Nish sitting in cafes, which, according to our host, is the national sport of Serbia. With a high unemployment rate, there's a lot of people to fill the cafes which seem to be on every corner. That said, they were all friendly, and the English level was really high here - we could talk with almost anyone under 30.
All in all, a great and interesting visit to Serbia. Makes me want to come back and see all of Eastern Europe.