Hotel Shin-Imamiya is a capsule style hotel and has great transport links around Osaka and Shinsekai is only a 5 minute walk away and once you have your bearing you can be in the Namba area on foot in 20mins or two quick stops on the subway.
The hostel itself really depends on the people staying and if they use the common area. The first day this was not the case but for last few there was a group of evangelists who talked to everyone and made the place more sociable.
It was nice to have a private room and the bed was comfortable even if the mattress was quite thin.
The staff are helpful but not overly fantastic or anything to write home about like in some other hostels.
I have enjoyed my stay at this hostel and in Osaka and now head to Kyoto where I get to stay in an ultra modern capsule hotel. I have been looking forward to the 9 hour hotel since I found out about it a couple of years ago.