The staff are excellent. However, the room en-suite is very small, and the room is small to also store your suitcases, but the excellent staff and good location more than compensates for the small room.
Breakfast is included which is very simple and nice, but only having continental style pastry cakes is not as healthy as Japanese cuisine.
But it is easy for the Hotel to provide, although it would be nice if they could offer some healthy option as well.
In summary, hotel staff are really helpful which is their greatest asset and the place is very clean and tidy, with good access to train lines. Haneda airport and Big Sight expo are easily accessible as well.