[achoice]

Yasuragi in Stockholm Sweden is a popular Japanese style spa retreat. Highly recommended if you have time to spare and relax. I love going especially in the winter to relax and leave the digital stressful everyday life.

https://www.yasuragi.se/en/

[deanc]

I can second this location. It’s more of a spa than an Onsen though. An incredibly expensive and award-winning one!