Okay so I am providing more info here for people who wish to go there.
At KIX Terminal 1, go to Bus station S-12, and take the bus departing on XX:45 until 10:45pm. These info is not available on net...
The room is super small, if your are having several large luggages, well...
not comfortable at all, the toilet really look like those on airplane... but we are in a hotel.
Get this hotel if it price is relatively low, but if it is above 100 USD, well I suggest you to pick another place.