This is a wonderful hotel in the centre of Hiroshima. Very trendy and modern hotel. The rooms are small but the price is worth the quality of the room and the location. We were 2 nights in a small room perhaps it would be better to choose a bigger room even if the price is slightly bigger. Hihghly reccomended!

We stayed here as we could not get accommodation out on Miyajima Island so I'm not sure how far away we were from the Peace Park, but being in Hiroshima in the past the transport is very good to get around everywhere here. But this was a great little hotel in a nice location with very helpful staff. The room was modern enough but for 2 adults travelling with a 4yr old & 3yr old (sharing one bed) it was very tight in a "Triple Room" which was two single beds with a fold out single sofa bed which took up what little other floor space there was left. But we had a high floor with a great River View below. We drove to the hotel and it was raining when we arrived after dark, but where the hotel is located there is no where to stop out the front to unload luggage or Children. They do provide a pre-paid discount parking voucher for car parking stations within a 2-3 minute walk away. The Breakfast was very nice and even though it was raining we sat out in a fully enclosed annex with a lovely feel to the place overlooking the garden. The breakfast cost is about JPY1,400 but was worth it I thought for the lovely selection on offer, scrambled or hard boiled eggs, chunky style baked ham, salad, pastries, breads, quiche, cereal, coffee, teas and juices plus of course Japanese options too like miso soup, rice etc. All in all I would stay here again but only for overnight stays as rooms are too small for a long stay with children in tow. But would be great for Couples since it is really well priced for Japan. About JPY12,000 for a Triple Room.

This hotel was a pretty good value for the money, but they try so hard to be a boutique hotel that it was not as relxed and comfortable as we would have liked. We arrived an hour before the official check out time and they would not let us checkin. They did take the bags up to the room before we came back, which was a classy touch you don't often see in budget hotels. The location is nice as it's right beside the river. Although the hotel is very close to the JR station, it's tucked away on a sidestreet and not very easy to find. The staff are nice in a hipster sort of way. The room was nice. The breakfast is served in a French restaurant downstairs. It was a little expensive at 1,200 yen and again, really trying to hard to be a "french" restaurant. It was nice, however, to eat breakfast next to the river and people watch by the bridge.

Apart from the attractive pics on their website we chose the Flex due to how its location fitted in with our itinerary. Our route was an am start from Tokyo so arrival was around 3pm which fitted in anyway with their published check in times. With only a 2nt stay planned our idea was to follow a fellow TA recommendation to go to Myijima island that late afternoon (possible sunsets over the Tori gate). On paper the location looked just across from the station so this would fit in with checking in and then walking back to the station for a bit of sightseeing to make the most of that day.
Flex Hotel theme is modernist particularly over the communal areas, Londoners will know the South Bank exposed concrete look. The rooms have a nod at white minimalist which is reflected even in our pics. However don't expect high quality fittings and finishes, when you get close it looks like a teenage student of architecture has been in control and taken a can of white paint to all the surfaces of the previous existing furniture and surfaces. The other half couldn't get on with the ceiling to floor column “design statement” that is in the way of the window and room either. The chairs are of a primary school size and the bathroom is like a cabin from a caravan too.
We originally requested the superior room but as there were no non smoking rooms left accepted a standard A room. Don't get me wrong the room was quiet, the bed was ok and for the price Y9k it was reasonable. They also offer a buffet breakfast for Y1.2k each which was not bad too and you don't have to reserve it in advance.
However contrary to our map perspective it is more like a 10-15min walk from the station. So you could commit to a taxi from the station to other hotels if they offer a better overall deal and then catch the street car back to the station and still achieve what we did on that day. (Would confirm that Hotel Active is just around the corner from a tram stop, the entrance looked very nice, but that doesn't mean the rooms are of course, and best of luck as we couldn't navigate their Japanese only website.)
We did enjoy the late afternoon on Miyajima island even though the waters were out and the gate was exposed. But be aware this island does seem to be totally given over to the day tripper and providing endless souvenir shops rather than a tranquil cultural centre. We then spent the second day at the Peace Park and the museums, this was well worth the several hours that went by, emotionally tiring but cannot emphasise how much rewarding, so we didn't try and fit anything else in that day other than having a walk around the shopping centre and a meal in the early evening.
Overall if you are aware of the limitations that we judged above it is still worth considering Hotel Flex as an option for a brief stay in Hiroshima.