Overpriced, dismal showers, slow and forgetful service
I recently stayed at this Hotel for a couple of nights. I was staying on the 8th floor. The shower, while nice with its glass enclosure and two shower heads, had absolutely pitiful shower pressure. Using one head was dismal and turning on both just made the water leak out of the showerheads. For such an expensive hotel, it was very disappointing. 
In addition, the hotel Wifi was so slow as to be unusable. They charge 30 dollars per day per device! That pricing model is completely absurd but I was traveling for business and needed wifi. After purchasing it, the connection speeds were SO SLOW it was completely unusable. I used the connection from the hotel next door which was free and much faster. 
I ordered room service while I was there. The food was okay (nothing to write home about), but they forgot one part of the meal. It took two phone calls and about half an hour for this to be rectified. The sad part was that it was an item that didn't even require cooking (ice cream). I was also surprised that when my room was made up the next day, the room service tray had been removed from the room, only to be placed right outside the door. I'm not sure why some hotel staffer would do that. I called before I left for my meetings for the day, and when I returned at lunchtime, the tray still sat there outside my door. By this point, I had given up on Hotel Nikko and even paid the 50 dollar penalty to leave a day early so that I wouldn't have to spend another night with subpar internet and mediocre service. I preferred being on a red eye flight away from that place.
The Hotel Nikko is a very average hotel with super premium pricing. I would rather stay almost anywhere else.