Stayed three nights during World Expo. Breakfast was spectacular, huge assortment of hot and cold foot items, breads, soups, meats, seafood, salads, fruits, I can’t even name them all. Great for if you want to try new foods as well. The drink options were even spectacular, with more than basic water and coffee/tea. There were some free perks after certain times, I think I tried a cold noodle dish after a certain time and it wasn’t bad. 
The room was clean, bed comfortable, there was a foot massager, no onsen, but nice shower.