Yeah, if you actually walk around outside of your cabin. I took this ferry last summer, pretty much didn't leave the cabin (except to look at Shetland Islands), only just before arriving. Having plenty of food, movies and games with me... yeah
If you take this ferry, make sure to do the stop in Faroe Islands, it's absolutely amazing.
I plan to sail this route again next year.
Side note: was it just me or this ferry or route is particularly rough? I crossed Baltic like 20 times by ferry (18h crossing), never got sea sick, until this one.
I think you miss out on lots of attractions if you spend the entire trip hibernating in the cabin ;)
My wife got a bit sea sick on the 2nd day on our way back, I didn't notice any difference. But sure enough, depends on how steady your stomach is...
Which part of the Baltic takes 18 hours to cross?
Anyway it wouldn't be too surprising it's less rough than the North Atlantic given the Baltic is closely wrapped in land.
Nynäshamn - Gdańsk. I've also did shorter routes like Ystad - Świnoujście and Helsinki - Tallinn
Stockholm - Helsinki, for example.