I'm not sure if it's accurate to call it a ryokan, as I'm unsure of the size of the hotel. There are tour groups - some Japanese, many Chinese - so it's not quite an intimate ryokan.
We paid approximately Y11,000 for one night's stay for two persons, inclusive of breakfast and dinner. I selected this hotel as it seemed value for money, and was one of the cheaper ones available.
The room was Japanese style - i.e. after dinner, the staff would lay out the futon for you. Dinner was served either in the room or in the dining room downstairs; we chose the former, and the staff would bring the food into the room. Dinner was a spread of different dishes - e.g. grilled salmon, rice, sashimi, soup, nabe (paper pot over fire - you cook udon and vegetables in it), pickled vegetables, etc. It looked like quite a feast, and definitely Japanese; however, we noticed that trays of food were laid out in a room in the corridor (where the staff was working) a few hours before dinnertime! And nothing was used to cover the food. Hm.. That said, it was winter and it was cold, so I doubt the food would have spoiled being left in the open like that. Still, my partner was uneasy about that (and we are not foreigners who would shun local food).
While dinner *looked appetizing, it wasn't all that refined (I have very high standards of food). Still, it sufficed. After dinner, we rang for them to clear our table, and the staff also came into make our beds. I've slept on futon beds before - and I like it a whole lot - but the futon bed at Toya Sansui was rather inadequately supportive, so all I felt was the floor beneath me, and it was uncomfortably hard. I had to drag out another duvet blanket, tuck it under my bed, to soften the 'bed', but it was barely adequate. I did not sleep too well.
Breakfast was served downstairs - mix of buffet and being served food. It was a Japanese breakfast, which I always enjoy. Rice, miso soup, fish, tofu, fruits, pickled vegetables, etc. It was ok.
There was a small TV in the room, a fridge, some tea, kettle. The bathroom was standard, old but kept clean and neat. I tried the onsen, and it was truly pathetic. There was an indoor one and an outdoor onsen; the indoor was fine, but not very atmospheric; the outdoor one looked promising but the water was barely lukewarm. There was a thatched roof covering the area so I could hardly look at the sky. I did not stay long.
Check in/out was easy; staff could hardly speak English, but she attempted to speak Mandarin with us and as we speak the language, we could communicate. This indicated that the hotel was probably catered to Chinese tourists...
Parking was free. The hotel isn't located by the lake, but just two blocks away. In the middle of winter, Lake Toya is dead - very snowy, but hardly any life. We chose to head to Lake Toya out of my interest in calderas and volcanoes (Mt Unzen, Showa-Shinzen, etc - those are definitely worth visiting), and to stay a night there to 'break' the road trip, but if I had known it was so dismal, I would have skipped staying a night there. Nonetheless, for the price we paid, it was a tolerable night's stay. I would think it's also a budget-friendly option for foreigners who want to have a taste of Japanese cuisine served in such a way, sleeping on futons, onsen, etc, but in my opinion this option is a poor one, but if you have a small wallet it isn't that bad.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.