First the good, the staff is excellent and very helpful. The building is relatively new, has nice amenities, and we had a great view of Ueno park from our room and from the onsen upstairs. The location is convenient and there are many shopping, eating, and transportation options nearby.
The things that make it a 4/5 are that, while new, the finishes in the building and rooms are not as nice as nice as some other properties. Also it should be know that one side of the hotel faces Ueno park but the other opens onto a street with lots of bars and nightlife. It is by no means unsafe since it is Japan afterall, but something to consider.