Centralbadet is a classic Stockholm bathhouse set inside a handsome Art Nouveau building. The draw is both architectural and practical: you can swim, use the saunas and jacuzzi, or treat it as a restorative break from the city centre.
It is more expensive than a simple public pool and can be busy at weekends. Go for the building, the old bathing culture, and the chance to slow down in the middle of Norrmalm.