I loved this place. It seemed to be owned by a Japanese couple. Super hospitable. It's across the road from the lake and bike trail (but not on the lake). They cooked a nice homemade Japanese dinner and breakfast, which was great. The portions were Japanese size, so if you are big, it might not be enough for you. But the meals were really tasty. The room was nice. Ours had one room upstairs for Japanese style beds and downstairs were normal beds.
We went in the transition from winter to spring, but I bet this place looks awesome in the winter when it snows and in the fall when the leaves change color.
The area is near a park and in a small town. It's about a 40 minute drive to Hakkodate.