It was a mix of Japanese and American style hotel. My room was spacious but had a tatami bed. The hotel itself felt more like an American hotel except, of course, for the soaking pools.
The reason why is that the breakfasts and dinners were all buffet which is a bit different from kaseiki.
Other than that, the all you can drink sake, wine and beer anytime was great. They even had a self serve soft serve ice cream machine!