We just got back to the US from a 10-day trip to Japan where we stayed in 3 different hotels and this one was by far the best.
The rooms are amazingly spacious and not just to other hotel rooms in Japan. The toilet was in a separate section from the bathroom with the double sinks, shower and separate jetted tub. There were closets and a shelf to put our bags. A pair of comfortable chairs to sit in by the window.
The bed linens and towels were of good quality and they provided shower robes and sleepwear. The toiletries were plentiful, again of good quality and included bath salts for the tub.
The location has good access to transportation. The foyer was low key and we had to walk a bit to the coffee shops, restaurants and convenience stores that surround Shinagawa station but that was minor compared to the luxury of the rooms.
We would stay here again in a heartbeat!