If you are looking for a peaceful hotel with western-style beds and food, but still want to try an onsen in private, 'Mori-no terrace' is ideal.
The hotel is about 40min walk from the station, but the hotel offers a shuttle bus. We drove, though; the hotel has plenty of free parking.
Lovely friendly staff who made every effort to accommodate us and our toddler. We mostly used Japanese, but the staff did speak some English.
The rooms are large and spacious, much bigger than I'm used to in Japan.
The hotel has several onsen hot baths, including the usual larger segregated baths, but also some lovely smaller baths you can try with friends and/or family.
Or family had a fantastic stay here. Highly recommended for couples, families or anyone else looking for a quiet break and a hot bath.