We stayed at this Westin for a few days on a short layover in Tokyo. Overall, we had a great experience at this hotel.
-the breakfast buffet is delicious. At 3600 yen, it's a little expensive, but we had a 50% off coupon. They have excellent smoked salmon, an omelet station, and extensive
-the concierge, Mirei, gave us excellent advice about things to do in Tokyo. She speaks great English and is a fount of knowledge about the city.
-there is an easy limo bus service to and from Narita, about 3000 yen each way. We were able to make reservations the morning of.
-there is a nice, big gym, and you can use the pool at another facility (I didn't use the pool, however)
-all the staff was super friendly and helpful
-they charge you to use the business center
-they charge you for wifi in the room
-as others have noted, it is a little far to the train, but it's a pleasant walk and mostly indoors or under covered walkways
Overall, we really enjoyed our time here and would stay here again.