Madness hostel (Hostel) -
Brace Jugovica 7 11000 Belgrade Serbia
From Belgrade airport there is a public transportation bus (number 72) or mini bus (E7) - price is less than 1 euro, or national air company JAT bus for 2 euro.
From main bus and train station there are tramways number 2, 11 and 13.
From every other point you just ask for a Republic Square (that is center of town). On Republic Square is a National Theater. We are in the street behind the Theater. Simple? Yes, it is.