Sixt Rent a car Serbia Zorza Klemansoa 19 Belgrade 011/328-7070 aleksandar.jovicic@sixt.rs SIXT Rent a car Serbia: Whether its a luxury, economy, or a midsize vehicle you need, for short term and long-term rentals, Serbia's number one car rental has it at all at bargain rates and #1 service. Serbian and English booking available via our website!