This is a nice little Ryokan in Kusatsu, Gumna. Its within walking distance of all the nice places we found in this great town. The service and food are great.
Its very hard to find. The map location linked above is accurate. You can access it from the road to the north or the south, but the north is much easier, even though it doesn't look it on the map.
The ryokan entrance from the north
You can book the ryokan at their site. There is also a phone number at that site which you could try (they do speak a little English.)
I'm not normally a big fan of inside onsens, but this one is totally wood and actually quite nice (sorry about the poor photography.)
More Photos (including other Kusatsu pics).