The Mandarin Oriental in Nihonbashi is one of the most luxurious hotels I've ever stayed in. The lobby is on the 38th floor, with rooms on the 6 floors beneath it - meaning the views are absolutely breathtaking. No detail is overlooked here - the rooms are immaculate and you get a beautiful bottle of sake as a welcome gift along with a few traditional snacks. There is a gorgeous bathtub with a variety of bath salts, and soft yukata to wear around the room. Overall, an incredible hotel.