To summarize so for:
It's west of Krakow and Budapest, and East of Dresden and Bratislava. That leaves a very narrow range of longitude.
It's on a good-sized river, or maybe a bay, and has a couple impressive-looking cathedrals. Expressway bridge with rail lines, gentle hills in the background. If it's east of Bratislava, it's certainly not Germany or Austria. Architecture makes me think it's in some former east-bloc country, perhaps in the Balkan region, or up in Poland. Anyway, it doesn't look like any city I've been to.
I'll take one more shot at it tonight, and maybe someone else can jump in with ideas. Gdansk?