Have stayed at the ANA several times and really enjoy each stay.
The location is central and if you are into jogging it's an easy run to the Imperial Palace, at night your a short, but roundabout walk to lots night life and restaurants. The hotel gym is good with everything you need.
Getting access to the concierge lounge is worth it as the complementary food is first class and the view is nice....the bar upstairs also has evening Jazz and city light views.
Ok...lots of good stuff, however, the rooms just are not on par with the rest of the hotel, they are comfortable for sure but on par with the nicer hotels in China.
The staff is fantastic and I will continue to stay here in the future.More