It's definitely not an onsen. Just a very small bathhouse that can fit 2 people (current COVID limit, maybe it could comfortably accommodate 3-4 people in non-COVID times). I'm assume the male/female sides are identical. There's a small locker room (maybe 10 lockers, but also likely shared by those using the gym/spa). The bath house portion consists of two showers, a small hot whirlpool, small cold plunge pool, dry sauna, and steam sauna. Each can reasonably fit 2 people at any one time). So definitely quite a small facility, but I appreciate the saunas and cold pool. I have a larger dry sauna at home at find it incredibly relaxing at the end of the day.

All but once I've had the bathhouse completely to myself. Reservations are required and apportioned in 90 min blocks.

One interesting change I noticed: in early Nov the bathhouse had only Le Labo soaps. Now it's stocked with Kotoshina's green tea product line.

-FlyerBeek