I enjoyed visited Cologne, however I'm not sure I would have enjoyed it as much if I hadn't had a local guide to show me around. I usually like walking around cities on my own but when I tried this in Cologne I couldn't find any of the cool bars or attractions. Maybe it was just bad luck on my part! However, once I made a local friend via Couchsurfing, he kindly showed me lots of very cool bars, cafes, parks and other hidden treasures. Definitely a nice place to visit for a couple of days.
Insider Tip:If you are looking for a cool bar, try opening doors covered in graffiti in the street that look like they belong to abandoned buildings. We found several unofficial bars this way! Also, 'Arty Farty' is a great bar/gallery to have a drink and a dance in.