When you stay at Tabist Kutsuroginoyado Hanagasa Kogenso in Obanazawa, you'll be 13 minutes by car from Shirogane Park. This hotel is 14.6 mi (23.5 km) from Road Station Obanazawa and 16 mi (25.7 km) from Akakura Onsen.
I thought I booked a room with toilet at Matsumoto Ryokan through the app. But at the ryokan, I was given one without toilet and had to use the shared toilet. Other than that service was good.