As a family of 4, we booked the largest room they had which they claimed slept 6, but I think that was optimistic if you're not Asian. I will start by stating that as an American I know I have a different cultural background and set of expectations than are going to be typical for Japan. I know we also have a greater average height, even though our family is not at all fat. This is the only Japanese hotel I've ever stayed in, so I don't have anything but what I've seen online to compare it to. That having been said, for us, it was very small. I get the impression that by Japanese standards it might be very large. As such, if you're a foreigner, or especially if you're on the large side, you will probably feel cramped. It was very clean, modern, and cozy. The kids loved the bunk bed setup. The staff were very friendly and helpful and spoke good enough English that we didn't have to do much phone translating to communicate. It felt very safe and secure and was very quiet... except for a constant whistling as the breeze blew in around the door that had no weather-stripping. I closed a folded up paper towel in the door to allow the air greater flow to reduce the tone of the whistling and drowned it out with white noise from YouTube. Beds were very, very firm... my wife said they felt like a fluffy rug had been laid on concrete. So if you want a more local experience, come here! If not, consider a European hotel chain. Also easy walk to lots of public transit, which was great!
