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I stayed in the Grand Hyatt, it was so small.
If you are Platinum with Marriot, I suggest you look into Prince Shakura Hotel, with your status, you can have access to the breakfast buffet. It is the best that I ever have had. The executive lounge is amazing with breakfast and happy hours food, the swimming pool, steam room, jacuzzi are the best. Cross street from the Prince Sakura is the huge train station with bullet train access, and other trains.
Best of all is the room … two queen-size beds, American-size room. You can say that only two people staying, but actually have 4 people staying. Two check in, and two come into the room later. 1 executive card access can bring in 1 guest, two people will have two cards, so 4 can come in.