Löyly opened in 2016 on the Hernesaari peninsula, about ten minutes by tram from central Helsinki. It is, primarily, a public sauna — three actual saunas, including a wood-burning traditional smoke sauna, all opening onto a wooden deck above the Baltic Sea — and, alongside the sauna, a bar and a restaurant. The bar is the right place to drink in Helsinki if you want the visit to be a properly Finnish evening. The right approach is the Finnish sauna ladder: hot, cold, hot, cold, drink. By rung.
Löyly takes sauna reservations through the website (€20 per person for two hours of unlimited sauna access); the bar is walk-in and does not require sauna participation. The sauna-and-bar visit lasts approximately three hours total. In summer the deck is open until midnight; in winter the bar is open but the deck is wind-protected. The cleanest end to a Helsinki day.