The rooms are traditional style and comfortable and quite large! Also, the common Japanese bath is very large, with all the amenities you may need and with different zones: outdoors and indoors, foot massage pebbles, cold bath, bubble bath, different high temperature baths, etc. The dining area is also very big and with a lot of different food for supper and breakfast!
I also has ping-pong, games room, etc.
But... I think the hotel needs a renovation, specially the bathroom in the room and the common bath. Not for the apperance, that looks a little old-fashioned, but for the condition of the bathtub and the sink in our room, the tiles in the baths, etc.
Although, we had a good experience.

Not so high expectations based on previous reviews on several trip sites, the public space was all renewed and clean, the room was quite space with 4 beds and one tatami space so that 5-6 people can stay in one room.
We chose foods with fixed courses in a large tatami room and it was awesome.
Hot spring was large but a bit old still enjoyable.

Good
. Location is good, right in the middle of the town, easy to walk everywhere.
. The lobby has a very nice lounge area with complimentary coffee at certain times of the day and also a place to indulge in classical music. Very very nice.
. The onsen is nicely organised, a few pools : 39degC, 42degC, outdoor 42degC area, and a jacuzzi.

Can be better
. The buffet dinner and breakfast is average.
. We were first given room 352, which had 2 problems, the door opens out to the roof like area (but guests are disallowed from walking out) which means that one may not want to keep the sliding door open for ventilation, and also the shower and bathtub were choked. We were later changed to room 951, much better.