During our camping trip in the south of Sweden in summer 2010 we went to Stockholm for a day twice from Nykoping, and I would love to go back and explore the city more in-depth. We really lucked out with the weather, the city is absolutely gorgeous in the sunshine. The buildings are beautiful, the water everywhere is amazing, the people are so incredibly kind and their English is good and the underground is clean and beautiful with every stop in a different style. We watched the changing of the guards, walked along the water from free museum to free museum, strolled in vintage shops and just enjoyed the day all around. Would recommend Stockholm to anyone, but bring good walking shoes! One of my favourite world cities, and definitely the cleanest.