I enjoyed it thoroughly.
The changing room is big,
The indoor pools' temperature ranges from 16°, 38° and 40°. They are cold bath, silk bath (superb) and mineral bath
And there are 2 garden pools, sleeping jet bath, which requires a button to turn on the jet, and soda bath (36°C), which this one, to my experience, wasn't as soda-ish as I imagined. I didn't see any bubbles on my skin when I dipped.
There are also sauna and steam room.
Do know that we are all nude while in the onsen, but its all normal, no one was judging our looks or weight there (that's in Hollywood - not onsen ^o^)
The staff were nice, the sales person in the lobby will try to offer you very expensive lotion haha.
And there are 3 areas where I wore jinbei, cold relaxing room, stonebed room and another resting room.
Must visit ^_^