I'm not really sure what we are going to do in Tokyo - we only have 2 days/3 nights there on our way to Finland, and one of those days will be to go to Disneyland or Disneysea. But other than that, I have no idea what we want to do there as I just haven't really looked into it.
I see that the Pullman is above a train line - so I'm guessing Transport around is easy - and it will be a brand new hotel, and a Pullman is always nicer than a Mercure!!