Transitioning from Sweden to Russia, I found the perfect way to do it, including a beautiful destination as Finland and Helsinki in between. So I took the Viking Line Cruise from Stockholm, Sweden to Helsinki, Finland. Almost a 14 hours voyage along the waters of the Baltic Sea, with some spectacular views of the Swedish Archipielago, and the coasts of Finland.
Visit Finland, arranged a lovely Luxury External Cabin for me, which I must say was much better and comfortable than I would have expected. Full small bathroom, comfortable queen bed, two big windows, TV, Minibar (with two complimentary bottles of champagne, which I drank on my own) and complimentary WiFi access through out the voyage.