Nicely reachable in Tokyo, quite big, one can spend a whole day here. One can ask for English instructions on a paper on how to behave/use the onsen. Food and entertainment are provided, recommendation for tourists.
Just a small part outside, this sento is at the 2nd level of a building. Not much green, not big. 1080円 for 1 hour (you bring your towel), 1700円 for 5 hours including towel set. Special rates on some days, I payed ~1200円 for the 5 hours ticket.