We stayed here for 3 nights with our two kids (aged 8 and 10) and would recommend this apartment to anyone visiting Hiroshima with family.
The apartment was very clean and comfortable, with all the amenities. The washing machine was great and the drying room in the shower worked well. The apartment even included laundry liquid and hangers with pegs.
Even though we visited in a heat wave, the aircon worked well.
We stayed in apartment F - which technically slept 8. We were very comfortable as a family of 4, but all the beds were doubles, so more could have used the room.
The location was superb. Easy, pleasant walk to the Peace Park, museum, ferry to Miyajima and Orizuru Tower (tower with observation deck, interactive room for kids and a slide to the bottom!). There was also a lovely supermarket (Spark) just around the corner and some great little restaurants (Okonomiyaki Carp, Parco della Pace and Roti bakery were highlights). Oh and a little playground about 2 blocks away.
I was a bit apprehensive about checking-in using the iPad, but that was easy. Just allow a bit of time for it.
On our last day we weren't leaving Hiroshima until the afternoon, so we left our suitcases in the lobby in the self-storage system for a couple of hours, which worked very well.