We stayed here for one night based on the high ratings on Trip Advisor.
Of all the hotels we stayed in Japan, all in the same price range, this was by far the worst.
The room was very basic, with low quality furnishing and garish colors. Which would have been fine, except the mattress was also very low quality, hard as a rock and very uncomfortable, and thus depriving me of a good nights sleep. The cheap mattress can't have cost more than the price of the room for the night!
I can't recall ever having spend a night on a more uncomfortable bed - and I have stayed in all kinds of places.
Otherwise the room was clean, and the service good, but what's the point of that if I can't get a good nights rest?
As others have mentioned, there is no wifi in the room, but the hotel staff will lend you a router for free.