Hotel Route-Inn Nakano did the job well, which was to provide us a place to stay for the night. Room was clean and non-smoking, as per request. Breakfast was fulfilling and extensive, staff was friendly and helpful.
Location isn't special, you need a car to get around. Beds, pillows and mattresses were quite stiff as usually in Japan. Bathroom was small. WiFi connection was good and overall no complaints. If I were in the area again, I would stay again.