My husband and I spent two nights in a private onsen room (#718). As neither of us speak Japanese, I had a friend help us make our room reservation, arrange for us to take the shuttle, as well as chose our meal plan - we chose the standard 'plum' course based on on-line photos. From reading previous reviews, I didn't expect staff to be able to speak a lot of English, but having lived in Asia for the past 4+ years, I find that we can usually get by with a translation app, and a little bit of patience.
As we missed the afternoon shuttle from Sapporo to the hotel, we managed to take the bus to Jozankei. It stops right in front of the hotel, so that was a plus! Upon arrival, there was an English speaking staff that was able to communicate all the information to us without any issues. We have visited a ryokan in Hakone area before, so were familiar with overall 'rules and procedures'. I would say if it's your first time to a ryokan, do some on-line research if you don't speak Japanese to avoid doing anything out of the norm.
Meal time was a bit trickier, as on the first evening the lady serving us did not speak any English; however, as it was a set menu and we have no allergies, we figured we'd just try everything. At following meal times we did end up with an English speaking server who was able to tell us what we were eating. Presentation of food was beautiful, and although ryokan food is not always our favorite, everything was of good quality. .
We popped into the private outdoor onsen one evening, but found that what we enjoyed the most was our in-room onsen. We could open the windows in that room without an issue, and on one of the days it snowed which made it completely picturesque.
In the evenings for a change of environment, we'd go to the lobby level lounge/bar area. There, you can enjoy a selection of teas, coffee, and small cakes. There is a super friendly bartender who speaks a little bit of English and makes great martinis!
As one other reviewer mentioned, getting from hotel shuttle drop-off point in Sapporo to the train station that goes outbound to the airport can be a bit tricky. Give yourself some time to get lost...
We had a very pleasant stay here, and highly recommend. As long as you are open to not having a fluent English speaking staff, and going with the flow when you can't communicate details, you will have a very relaxing stay.