The hotel's cleaniness, room size and staff are what you'd expect from a Japanese hotel in this class.
Strange and not pleasant were two issues:
1. Upon check-in we were conditioned to paying a 300 yen "public bath" tax (I'd guess the onsen use tax), although we clearly told them we would not be interested in its use. We were told all hotel guests were required to pay that tax.
2. The air in the room was damp and stuffy and the only way to refreshen it was by turning on the (rather noisy) air conditioning system; which in fact was only recirculating the air.