Solaniwa Onsen before flight back

Hi, it is our first time going to Japan next week. We are thinking of experiencing Onsen on Osaka. Our check out to our accommodation is 11am, while our flight is late at night. So we are considering going to Solaniwa Onsen before we ride the train back to Kansai Airport.

May I ask is it ok to bring luggage to the place, do they have locker room we can place our luggage? Or is there nearby locker storage place we can check in our bags before we go to Solaniwa?

Thank you in advance, let us know if this is good option!

by Simonsnowspier