The karaoke and the onsen are good, the rooms are big.
The staff speaks japanese only and is not really willing to help otherwise, there is a constant "music" played in the whole hotel space, clearly hearable from the rooms until 11pm, and there is a weird smell of "old wet carpet" throughout the hotel. The only public transport to get to the city is a bus that runs about once per hour until 7pm. There is only wifi in the lobby, the rooms are equipped with only few power plugs.
This hotel is not suited for foreign tourists who travel by public transport, but rather for japanese fluent speakers who want to relax and stay in.