We really enjoyed the Setsumon. We stayed in a Studio. It was two 30 somethings, and a 12 month old baby. The Studio is one room, but it is big. It has a kitchen, tv, couch, and bed. There is also a long entryway (genkan) so you can put your boots and stuff. We put our baby in the crib in the corridor. It worked well.
The Setsumon is very central in Hirafu and easy to get to lifts, shuttles, and convenience stores. We did not go to restaurants, but there were several nearby.