Yuinchi Hotel is fantastic! We booked a Japanese family room which is very spacious and has a sea view too. However, the toilet is not well ventilated, so there is a lingering stench.
The onsen is located in another building, a short walk from the main one. The pools face the sea too, and it is so great having this view while enjoying the onsen!
The breakfast buffet is substantial with a good variety. They even provided organic milk from the local EM farm!
The carpark is quite dark at night, because there are only a few street lights. Yuinchi is located on a hill, so it is also quite chilly at night.
Overall, this is a great hotel to stay at. Highly recommended.