We have had exceptional experience of Mitsui hotels on previous visits to Japan so when looking for a hotel in Hiroshima we saw this hotel and decided to pay a lot extra than we usually pay, but what a disappointment it was.
Firstly the reception desk was a messy disaster, not that the staff do much for you everything is done at a machine, very impersonal and not a 4 star experience. The lounge part of the lobby, which looks enormous in the on line photos, is actually quite small and very dated. Some if the furniture was worn and stained, in particular a leather ottoman is all damaged on the edge and the buttons have no finish left on them, white not brown.
The room floor was obviously renovated recently, the corridors are nice enough. The room was pretty bland, all white apart from the blue striped feature wallpaper behind the beds. We booked a room for three, we had three beds in a room obviously designed for two, there was only about 9inches between. So the whole room was filled with beds apart from a strip about four feet wide which had lots of furniture in it. The walls are already marked and the furniture chipped.
Worst was the bathroom, the original Japanese prefabricated +/- 4'6"x5' bathroom obviously original and not touched by the renovation. Reasonable condition but too small for the money, greenly where the toilet joined the floor and a dirty light switch outside.
The lounge on the 25th floor does have stunning views.
Definitely not worth the price