Arietta is definitely one of the best budget hotel I have stayed in Japan so far. The room is suprisingly bigger compare to ordinary Japanese hotel, the bed is big, also the bathroom as well. Free coffee and breakfast available every morning.
The location is excellent, as it is very close to the metro station, Honmachi, only one stop away from Shinsaibashi, and about 4minute subway ride to Umeda, very convenient in my opinion.
Will definitely stay in this hotel again if going to Osaka again.