Ikkyu is a supersento a stones throw (or free shuttle bus) from Universal Studios Japan in Osaka’s port area. Thanks to the tourists from USJ and that it’s the only supersento in the area Ikkyu is very crowded. Uncommon for supersento there were locals that knew the staff and were chatting with them friendly as if it were a downtown sento. My wife and I also noticed many tourists from all over Asia in the baths most likely resting off a long day at the theme park. Ikkyu is very well designed and appointed supersento filled, almost exclusively, with a clear and odorless hot spring water that was slippery to the touch. The onsen here is a real gem if you are looking for the smooth and slippery feeling water. Each of the baths was lined with a light brown mineral buildup from the that seemed to be easily chipped off. There were also a few sings explaining that yu no hana (deposits) might be floating in the water. All of these are signs of a good spring for me. The baths were either concrete or wood lined, no bright tile here. The lack of bright lights and tiles helped relax and subdue crowded, noisy bathing areas. I enjoyed the selection of hot (43), normal (41) and warm (38) baths, although I wished the hotter one was a bit hotter. Ikkyu is a very well designed supersento with great water near a major tourist attraction so I cannot complain that it is crowded, but it is something to be aware of. The very tight entrance and sitting area in the front made getting in and out of the bath somewhat stressful. I also found the changing room to be very small and to be very hot. Some of the outdoor baths had a strong chlorine smell, but that was reassuring that they are clean and for me a good thing as the smell reminds me of hotel pools back in the USA. These few complaints are minor compared to rest of the Ikkyu experience however.