This looks like a great find! Thanks for telling us about it.
We are going to Turku, Finland via Stockholm in September. Based on previous experience arriving at Arlanda airport and then taking the Silja Line ship the same evening, we are so tired that we do not enjoy the wonderful buffet dinner or the scenery of the Stockholm archipellago. When we arrive in Turku the next morning, we are still tired. This time we may try to get a small room at Rest and Fly for several hours and then board the ship that same evening. I think 2-4 hours of sleep would make a lot of difference...and we wouldn't waste a day either. (We've been to Stockholm several times before and have pretty much seen everything.)