We stayed at Myoko no Mori for 4 nights around new year, and we really liked it. The rooms are very spacious, and everything is quite well maintained. I really liked the onsen (Japanese bath), although it doesn't have a proper 'rotenburo' (open air onsen). The staff is excellent, extremely friendly and willing to help their customers in anything they need. Examples: They let us check out at 4pm on the last day, they delivered breakfast up to their room to the ones of us who didn't make it on time to the restaurant room (we didn't even ask for it), they provided us with all sort of discount tickets, information and suggestions, they gave us some 'thank you for staying with us' gift on the last day. Cannot comment on their English speaking ability as most of us could speak fluent Japanese.
On the downside, breakfast was always the same and not amazing, and the ryokan is not walking distance from the ski slopes (but within 3km there are three ski resorts, and there is a bus taking you there, although we didn't take it as we had a car, not sure how frequent the bus is).
Overall a great experience, highly recommended!