Sauna Odín is the only gay sauna in A Coruña. It is in Os Castros, a residential district south east of the centre, on a short side street rather than anywhere a visitor would walk past by chance, so it is a deliberate trip out from the old town.
Inside there is a Finnish sauna, a Turkish steam bath and a jacuzzi, along with a cinema room, a dark room and a bar. The rooms are modern and kept clean, which is the thing regulars mention first.
The crowd is men and mostly local. How busy it gets varies a lot, and finding the place nearly empty is a real possibility, which is worth knowing before making the journey.