Entry 1: Spa Safro
Sapporo, Japan
Susukino is Sapporo's late-night district, and Spa Safro is built for it. The capsules come with a full bathing floor attached.
That bathing floor is the point. Hot-spring water fills the indoor and open-air baths, with saunas and a steam room alongside. Plenty of visitors come for the baths alone; the capsule is what lets them stay the night.
Sleeping areas are separated for men and women, and each capsule has its own light and screen. Sapporo winters are long. A hot bath one lift ride from the bed counts for a lot.