Stayed in Hilton Tokyo in the Shinjuku area when in town for a business trip. The hotel location is convenient in terms of access by the airport shuttle bus, as well as the Narita Express train, although the location of Narita itself makes it time consuming to go back and forth.
In terms of Tokyo it's well connected with a subway station in the basement, however, subject to location of meetings etc. it is recommended to think through Hilton's location relative to this. My business was East and South West respectively and a fair bit of time was spent commuting.
The hotel is top tier, and I will definitely stay there again. In particular the service level is top quality throughout the hotel, from the bell boys you encounter upon arrival till the reception staff upon check out.
The hotel is fairly old but seems to be recently refurbished, and the interior decoration of both common areas and rooms is state of the art, and has all the facilities.
The club lounge is an experience in itself, and highly convenient during the day for business purposes. The evening coctail and snacks session is unique in its class, and I must commend the staff for making an extra effort as well.
The gym is well equipped and convenient as such.
The onlyd drawback if anything would be the beds/ pillows; they will not get a top score but then again, that's a highly individual thing.
The hotel has everything you need at an acceptable rate in Tokyo, and I will definitely keep it as my first choice for both business and private purposes when going next.