Yes, 100% sure. I recognize the place and plus you can tell by the tables behind the windshield which are showing many routes to different places around Niš. Here's the same place on street view.
Even the same car is parked there as on your photo
The buses have BG plates because the company which owns them is based in BG and they never change plates. It is like that around here. But all of these buses are replaced now. Niš has a contract with a company from Požarevac and all of their city buses have PO plates now (only some of them have NI and BG).
And I can't fix it as I'm not a curator/moderator. I'll send error reports.