Would Love to Return... Industrialized yet historically interesting city
I was only in Cologne for a night, but I'd definitely return. Though industrialized and cluttered, the city maintains a lot of its historical and architectural charm. Can't say anything about the entertainment options, as I was only there for an afternoon and one early evening.
Insider Tip:The Cathedral of Cologne is the biggest and most impressive church I've seen (including what I saw at Rome and anywhere else in Germany or CZ).