The facilities are okay. It has bubble bath, an indoor large bath, outdoor two pools one cooler, another hotter. Two saunas, one medium hot and another extra hot. The facility is kept clean and has a nice relaxing atmosphere. With pricey body treatment zone than usual for Tokyo.
The onsen hot springs water here is dug from 1,700 meters below ground, is a bit salty reflecting Tokyo's position, and brownish in color.
When you check in, you are thoroughly reminded that people in tattoos are not allowed in. This is a general quite strict rule concerning onsen places throughout Japan. It is related to organized crime gangs bullying on the institutions to sneak out money, by citing discrimination against foreigners with tattoos being allowed but locals with tattoos (a marker of being in a criminal gang) not in. It's nothing personal, and it should be pretty obvious as it's written in countless guide books to Japan and reminded at the reception of this facility.
So if you are with tattoos, you should go to another place, like Jakotsu-yu sento in Asakusa, which is significantly smaller but not bad, with similar onsen water. Local yakuza men and their apprentices are seen taking bath there, with remarkable tattoos.
Why tattoos are associated with crime in Japan is a long story, but it's just local culture to respect and not hurt your body which is given by your parents. It's understood that things aren't that way overseas, but here it's Japan.
Ignoring all this and going in without bandage over your tattoos would mean being politely asked to leave. Unlike some reviewers here, I don't think the institution is blamed for keeping a normal restriction so as to protect themselves. It's pretty decent.
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