Picture from a European city in the 1950-60s

My parents found this photo in one of their boxes and have no idea where it's from.

They lived in West Berlin in the 1960s, but travelled to East Berlin, Eastern Germany/ the GDR and Czechoslovakia. (Also through most of Western Europe except for the PIGS, but imo, this picture has more of an Eastern European look to it.)

It's also possible they didn't take this picture themselves and got it from someone else's estate, so really, everything is possible. 🙈

From the looks of the photo print, I'd place it in the 1950-60s, since my parents switched to larger format print and also more colour pictures in the 1970s.

Thanks for your help!