Proper USA/European size hotel room, with fancy Japanese toilet/bidet in the bathroom. Furnishings starting to get just a little tired in places, but still perfectly adequate.
Stayed 3 nights, only used the breakfast buffet, not the evening meals. The breafast, on 12th floor with good view, was mostly Japanese style, but also has brown & eggs, and some rolls/croissants for more western preferences.
Mattress too firm for my personal liking, but good pillows. My "non-smoking" room was just that, with no tobacco odours (unlike that of a colleague who accidentally got a smoking room, so make sure you book the correct room type).
A simple few hundred yards walk to the Mito train station area, with numerous shops, cafes & restaurants.