We stayed at the Rihga Royal Hotel Hiroshima for two nights in September 2012. Upon arrival you will be impressed with the spacious (and eerily empty) lobby. It's an incredibly vast space that feels like it takes up a city block, but we rarely saw more than a dozen people at any given time during our entire stay.
Rooms start on the 14th floor and go up until the 33 floor, where you'll find a restaurant and bar with nice views.
Our room was on the 14th floor and was a bit on the small side for a room with two beds. The view (facing Hiroshima Castle) was pretty enough, though. The AC system works incredibly well and kept us comfy and cool. We didn't hear our hotel neighbors so soundproofing is good.
As with most Japanese hotels, the beds are EXTREMELY firm, but there's not much you can do about that. The room came with a dorm sized refrigerator, but no safe.
The decor is a bit dated for one of the cities "top" hotels. The place definitely had it's prime back in the late 80's and early 90's. The room had some carpet stains and the bedspreads are a very dated floral pattern (with a plastic-like lining...presumably for bed bug prevention).
The bathrooms are clean and simple, with soap/shampoo/conditioner dispensers attached to the shower wall, but the decor, like in the rooms, was dated with light pink tiles and the absolute worst washlet toilet I've seen. There were no buttons, just a dial that barely produced enough water to moisten your backside. They may as well remove it.
However, the staff is friendly, the views are great, and the location was great for any tourist. An art museum is next door, the Castle and shrine are a block behind that. In the other direction, you're just blocks to the A-Dome, Peace Park, and Peace Museums. Also nearby is a covered shopping district with tons of shops.
Attached to the hotel is a shopping mall. Signs say the restaurants on the upper floors are open until 10pm, but we headed out for dinner at 9:15 and every single restaurant said they had already stopped serving. We ended up a basement level Chinese restaurant (that was good). So, be warned...despite the presence of a hi-rise hotel, bus station, mall, and department store, this area is rather deserted at night. It's not unsafe, but don't expect any local conveniences (shopping, bars, dining) past 8pm.
The top floor bar had lovely views and we went up there one night for drinks and sunset views (it faced the opposite side of the building than our hotel room so we could see the water and Miyajima Island, plus the Peace Park and A-Dome). As you would expect from any top floor hotel bar, drinks are overpriced, but the space and view are a nice for a relaxing drink if you've got some yen to spare.
There is apparently a decent spa/gym facility onsite, but it's not included in the room price and at (if I recall correctly) 3,000 yen per day to use it, seems a bit overpriced.
All in all, the hotel is convenient and quiet. The rooms (at least on the lower floors) could use some updating: new carpet, new bedding/linens, but it's not a horrible hotel. For two people at just 10,500 yen per night isn't so bad in a major city.
You can get cheap/simple rooms on the 14-16th floors for just over 10,500 yen.
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.