i have several experience to stay in Dormy inn in Japan, this one Namba premium has nature hot spring inside, you can take relax when return back after sightseeing in downtown, the room is clean but too small, seems all dormy inn series in JP are all small so i was not expected to get a bigger room. the breakfast is good, the location is 10 mins away by walk, but they provide free shuttle bus if you want to reach Namba station, so it is convenience for people when heading to airport with luggage and need to take train from Namba station. overall i have good experience in Dormy inn Namba.
Hotel is very new and staff are very polite.
I mistakely booked a room with 'no view', but there is a big window in the room with a frosted glass. This is quite unsatisfying so pay attention during your reservation.
If you are with big luggages please make use of the shuttle bus otherwise the 10 minutes walk to metro will become 20 minutes. The floor in the spa is a bit slippery, becareful too. Spa can be improved, personally i prefer the spa in Dormy Inn with a lower price range.