Situated right next to the Zenkōji temple. Up a slope so if you’re coming with heavy luggage, I would recommend the bus or taxi from Nagano station. Has a nice traditional breakfast option. There is a dinner option too but you’ll need to reserve one day in advance, or at the very least, in the morning at breakfast time. There is a public bath within the building itself but it’s pretty small, however given that it’s a small guest house I don’t think it will matter. You would probably be able to use it whenever you want to.
The rooms are cozy and very well appointed. Futon bed is laid out for you, and is taken away when you step down for breakfast so be mindful of that.