Osaka is a fun and wonderful place to visit. However, this hotel is not. Let's start with the pros.
Pros:
You are within walking distance of train and subway stations and 20-30 minutes from the most popular locations. The neighborhood is quiet, but you can hear the trains from your room throughout most of the night. Even from the top floor.
Cons:
There are no staff, and everything is automated. You use a code for everything, even to enter your room. This system causes some frustration when it doesn't work, either when you want to enter or exit your room. Yes, the system also requires you to use it to exit your room.
Even by Japanese standards, the bed is as hard as a rock and small. If you are a western family of 4+, you will not be comfortable here. There is also a funky smell in the room, like stale urine.
You could walk about 40 minutes to Dotonbori or take the train one stop to Namba and walk another 15 minutes to get there. It's not really close, but not very far either.
But nothing else is close by, including food and drink, so keep this in mind when book.
Overall, would not stay here again and would book something closer to more dining options.