Facilities: Shared showers, bookshelves, a lounge, gas stove, and rice cooker.
Cleanliness: Quite clean.
Environment: Very nice, close to Atami tram station.
Service: Excellent. We were supposed to check in at 6 PM, but they let us in earlier because it was cold outside.
Economical and good value for money.
Not recommended for a newbie. Check-in procedure was really complicated for foreigners, making a call to the host to get the password of the key box. Without Japan number I contacted the host by e-mail in Japanese instead that took some time. 500 yen onsen fee is compulsory. You need to pay more for a towel or amenities. The room and communal area with a small kitchen was good.