We've stayed at Hearton Hotel Shinsaibashi before and the reason we came back is mainly because of the location - lots of great food and shopping near by, easy access to train station. The staff at the hotel are excellent - friendly and helpful. This time we stayed in the annex building which has central air conditioning so you can't control temperation in the room yourself. The weather was hot and for some reason the hotel was only using the FAN and not A/C so it was very hot in the room. But guests can ask the staff to open the window which we did and the staff happily obliged. There are signs at the front desk and in the elevator telling you if they are using the heat, or the fan, or the air conditioning that day. So if it is a hot day and the sign says "FAN" you can tell the staff at the desk right away and they will come open the window. You can't lock the window and will need to get the staff to come back to do that, but as I said the staff is great and will help you right away.