Unfortunately the name of the sender is not written on the card, but thanks to them :)
Belgrade (/ˈbɛlɡreɪd/; Serbian: Београд / Beograd; [beǒɡrad]) is the capital and largest city of Serbia. It is located at the confluence of the Sava and Danube rivers, where the Pannonian Plain meets the Balkans. Its name translates to White city. The city proper has a population of over 1.2 million; its metropolitan area within city limits is populated by 1.6 million people, making it one the largest cities of Southeastern Europe.