Our family of 6 had an excellent experience at Burg Liebenstein. We reserved 2 doubles, with a 3rd bed added to each - and were given the entire top floor of the 'tower'! Rooms were good sized, even when overloaded we had room to move around comfortably. Mattress a bit hard for our tastes, but overall bedding was clean and comfortable. Plenty of towels too. Kids loved all the peaked doors, bright colors, and "medieval style" furniture - not authentic of course, but fun.
Dinner was delicious, ordered from a truly extensive menu given the size of this place - local favorites, some international dishes, and some "kid friendly" items too. Great wine and beer selection. Breakfast was also great, so many choices of bread items, plus meat, cheese, yogurt, tea and coffee.
Staff was friendly for Germany - not constantly smiling, but happy to help, quick to get anything requested, and very accomodating of the children.
We'd definitely stay again!