Chubu Nagano
Mercure Nagano Matsushiro Resort & Spa
メルキュール長野松代リゾート&スパ
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Onsen hotel or inn. Hot spring (spring details not checked)

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
入れ墨があっても利用できますか タトゥーカバーシールをご使用の上ご入浴ください。
In short: Tattoos must be fully covered with cover stickers.
Where it is
Chubu region, Nagano prefecture. About 170 km in a straight line from Hakone.
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Rules can change. Check the official page on the day you go. Any paid link is labelled next to the button. We have not visited this bath ourselves.