Very much as advertised and described; A capsule bed, with showering facilities, slippers, towel & pajamas provided, and a location ideal for those travelling from Tokyo central to Haneda airport for an early flight the next day.
The beds were harder than expected, but the mattress and pillow were plenty comfortable. Very little sound isolation, so it is highly recommended that you bring earplugs if you are a light sleeper.
Shower facilities are highly recommended; You have a choice between a traditional and hand-held showerhead and a 'rain' style showerhead, which is much gentler from a greater height.
Location was very close to both the direct train line to Haneda, and Kamata Station for those travelling from Shinjuku/Shibuya.
English speaking staff were available when I both checked in and out. I would definitely stay again.