We had celebrated our special days in this hotel for couple years now.
We liked it because the rooms are large (esp compare to other hotel in Japan), soft carpet, and the location. It is right in the center of Odaiba, it has a shuttle bus to YCAT, to Disneyland and to Venus Port Mall (so does Nikko hotel but Le daiba is slightly cheaper and has bigger room).
However, last year when we want to celebrate our daughter birthday, they were full-booked and when we went to directly ask the receptionist, the response was very cold (not even decent apology), considering that we are returning customer, they didn't show any recognition what so ever. Disappointing.