Absolutely wonderful.
The owner was so nice and helpful. After just mentioning what we were planning to do the next day, he went way out of his way to give us all the information we needed. I had thought we knew what we needed to know, but turned out we had faulty info. His advice saved us a lot of time.
The room was small, but very clean and the ac worked great (in the middle of Osaka summer). The shower and bathrooms are communal, but no problem at all and easy to access. All very clean.
If we spend another night in Osaka again in the future, we will definitely stay here. Great value and location (near the aquarium and Universal Studios Japan).