Kusatsu with private onsen recommendations

Hi, planning to visit Kusatsu onsen with my BF for either 1 or 2 nights.
What ryokans would you recommend for us to stay (would love to have breakfast and dinner served there, also private onsen bath with spring water in the hotel room).
Are dinners and breakfast filling enough or did you have to buy another meals after that to be full?

by Shot_Field_629