I agree with the majority of positive reviews here. I had a very nice room with a view of Tokyo Tower.
However a warning for those people staying in the in-between seasons (spring and autumn). I was there during a warm spell in April, however the air-con is centrally controlled and set on heating. (The girl at the front desk read from a prepared script in English basically saying it's April therefore the heating is on regardless of the actual weather).
So I was left with the choice of sweltering at night or opening the window (which meant it was very noisy with a construction site nearby).
In other hotels in a similar price range you do have much more control over the temperature in your room.