It's a real pleasure staying in this amazing apartment. I guess you cannot find a hotel/apartment with a better location. Hibiya Park is right on the other side of the street. Ginza, Tokyo station, Imperial Palace, Tokyo Tower, and Tsukiji market are all within walking distance. Shinbashi has countless good food and izakayas. It is also a transit station for Yurikamome line if you want to visit Odaiba.
The room is well decorated and maintained. I really like its elegant modern minimal style. Since it's not a big building, the apartment takes up the complete floor. It's a quite unique experience to take the elevator directly into your room.
Thanks Itoe for the detailed guidance, which makes check-in and check-out very easy.