The text on the billboard is in Bulgarian ("СВАЛЯМЕ ЦЕНИТЕ"), which strongly points to Bulgaria. The architecture, featuring large, utilitarian, block-style apartment buildings, is very characteristic of Eastern European urban residential areas. The mountains in the distance suggest the outskirts of a city like Sofia, which is surrounded by ranges like Vitosha. I am fairly confident this is in Bulgaria.

I suspect this is in Sofia, Bulgaria. I am 70% sure.

then: forward

The view confirms the previous assessment, with the prominent Vitosha Mountain clearly visible in the background, which is the iconic backdrop for Sofia. The architecture and the general urban layout are consistent with residential neighborhoods in the southern part of Sofia. The lighting and vegetation suggest a pleasant climate typical of the Balkans. I am now very confident in this location.

I suspect this is in Sofia, Bulgaria. I am 90% sure.

then: guess