Kasen-An Seni Onsen Iwa no Yu

A last-minute cancellation opened up, and I was truly lucky to get a Reservation at this Accommodation—often said to be “the hardest to book in Japan.”I’ve stayed at many Onsen Ryokan across Japan, and I think this one is the best.From the parking lot to the Room, I was surrounded by beautiful greenery the entire way. It was such an atmospheric Ryokan—like stepping into another world. At check-in, enjoying the greenery and the sound of the river while having delicious welcome snacks instantly made me forget the day’s busyness, fatigue, and even the intense summer heat. It felt as if time had stopped, and I became completely calm.The Room was spacious and spotless, and it even had a CD player, so I could truly relax.The indoor bath, their signature cave bath (“Cave Onsen”), and “Musou,” a private Onsen—all of them were outstanding.The food was probably the most delicious meal experience I’ve ever had during any stay. In particular, the salt-grilled ayu sweetfish, brown rice soup, and Shinshu Orein pork shoulder loin were exceptional.After check-out, it was also fun to take a walk along the promenade trail.Thank you to all the staff for your kind hospitality.This is an Accommodation that exceeds expectations—I had a deeply satisfying stay. Now I understand why it’s so hard to get a Reservation. I’d love to come back in another season!

It was an Accommodation that far exceeded our expectations—so wonderful and captivating that it’s hard to do it justice with any words. The moment you enter the grounds from the main road, it feels like another world. From the warm welcome to the gentle flavors and beautifully presented welcome drink in a lounge filled with greenery, everything was exceptional. Greenery everywhere—everywhere you look. The furnishings ranged from dignified pieces with a sense of history to items with a handmade feel, blending Japanese, Western, and Asian styles into a soothing space that never felt overdone. The large public bath, private baths, and cave bath—I can’t count how many times we went in.The cuisine was equally impressive: wholesome mountain-village dishes that were kind to the body, yet beautiful and delicious one after another. The tableware was wonderfully varied too—from substantial earthenware to wooden pieces; even at breakfast, some grilled dishes were served on Royal Copenhagen plates.Above all, the staff were truly outstanding. I’m sure there are manuals in place, but no one relied on them—the warmth of each person made it clear they genuinely love their work and take pride in it. My husband enjoys gardening and ended up asking a young male staff member all sorts of questions about the trees; we’re sorry for taking up so much of his time.From start to finish—including seeing us off until we were completely out of sight—everything felt comfortable and welcoming. It was our first experience leaving us so deeply satisfied both physically and mentally. We completely understand why Reservations are so hard to secure.