As of Sept 2019, for some bizarre reason they will only clean your room if you hang up a "clean my room" sign outside of your door. We were not told this during check-in, and there was no mention of it in Japanese or English in their material in my hotel room. Naturally we were very surprised when we got back to our room on the evening on day 2 to a room with no new towels, no nothing. To be fair once we called reception they came up with new towels and such, but still somewhat bizarre.
A couple of days or so before going to the hotel I'd made a booking for 19:00 for dinner for my first night. I arrived at the hotel to be told that "maybe I can eat there at 18:30, but we'll call you". 18:25, waiting in my room, no notification at all from the hotel. I call asking what's going on, they say had booked me for 19:30 (without my consent). Then they call a bit later saying that 19:00 works after all...Totally unprofessional considering it's a hotel in Japan.
(I speak Japanese, so misunderstanding due to languages is out of the question).
Otherwise the food was nice and the facilities were good.