Osaka Castle Park

The room was basic and clean. The main issue was that the air conditioning was disabled in the room. There was a sign in the room stating it was controlled across the whole hotel and I wouldn't be able to turn it on. It was quite humid in Osaka when I was visiting, and the lack of AC meant I had to keep the window open the tiny amount that was allowed. This made the primary purpose of the hotel to "Just Sleep" a bit more difficult than I would have liked. If you don't mind being a little warm and sweaty during the night, you might be okay. I found it difficult to sleep and get comfortable in the warm humid nights. I would suggest calling ahead to see if the air conditioning is allowed/enabled before making a trip to this hotel. Or perhaps only go in the cooler months.

Room was absolutely enormous compared to everything other accommodation we had in Japan. In unit laundry made the trip a lot less stressful and rooms even include cooking appliances to make sure you have everything you need to keep comfortable.