Below you will find a list of Hotels close to the Conference Venue.
It must be stressed that booking meta-sites (https://www.expedia.com/; https://www.booking.com/; https://www.airbnb.it/) are an important resource for finding accomodation in all price ranges.
The Knot Hiroshima (7 min by walking from the conference venue)
https://hotel-the-knot.jp/hiroshima/
Dormy inn Hiroshima (8 min by walking from the conference venue)
https://dormy-hotels.com/dormyinn/hotels/hiroshima/?utm_source=google&utm_medium=gbp&utm_campaign=gbpurl&gad_source=6&gad_campaignid=22921448145&gbraid=0AAAAA9tPv2UHS6rYjYGKsjCOjGzTx_xiR&gclid=EAIaIQobChMIwNf_seyUkwMVTtwWBR3CLCA-EBEYASAHEgJG9fD_BwE
ANA Crown Plaza Hotel (9 min by walking from the conference venue)
https://www.anacrowneplaza-hiroshima.jp/
Hilton Hiroshima (14 min by walking from the conference venue)
https://www.hilton.com/en/hotels/hijshhi-hilton-hiroshima/?SEO_id=GMB-APAC-HI-HIJSHHI
However, there exist various type hotels nearby the conference venue by walks, bus or city trams.