There are many hot spring (onsen) areas around Iwate prefecture.
I stayed at Osawa onsen in Hanamaki onsen area.
Osawa onsen has three parts.
I stayed in the cheapest area, which includes a community kitchen, for around 3000 yen per day.
It also has a good soba restaurant on site.
The building is over 200 years old and it is very unique.
The bath water is very soft and makes your skin feel smooth.
One of the outside baths is for mixed bathing.
I recommend this place.