Absolutely lovely place. At first I thought I'd be uncomfortable with how spaceous the room was (I'm a very jumpy solo traveller), but the room was just so comfy with an excellent view. The heater was a bit hot, but there was an electric fan too, so all was great.
The hotel allows you to have a free 50 minute private bath each night, and the private baths are amazing, able to accommodate up to five persons and with windows to let in the light and stuff. Excellent onsen water -- very acidic and very hot. Takes some time getting used to the heat, but once you do it's a heavenly experience. There are also public baths (free of charge) that you could enjoy throughout the night and into early morning (they're closed for cleaning only during 9-12 in the morning), one indoor and one outdoor, both connected to one another. The outdoor one is a bit small, but it's so refreshing to be able to flee from the stifling indoor onsen to enjoy the crisp winter air while soaking up in the heat.