You book a castle like this on a little bit of faith that the owner has represented it well and the only criticism is that he did not do it justice. The castle is beautiful, in lovely surroundings, medieval but incredibly comfortable with excellent heating, furnishings and everything you need for your stay. The owner is incredibly gracious, putting up with all of our questions about the history, and the area - generous with his time and kind to our kids. It is an incredible experience to stay in a castle like this - even if the weather is bad and you are staying in, you look around and realize that you are having an amazing experience just being there.
The historic winding stairs would be tricky if you have mobility issues, but other than that, each floor has something special from window seats, to the chapel room ceiling, to the nooks in the little bedroom, the gallery over looking the dining room, the window swing, priests hole, hidden stairs to the ramparts and murder hole. And these Americans were dazzled to be using antiques that would have been behind glass in the states.
I cannot recommend this more highly - and have raved about it to all friends and family. You can see our tour on YouTube - Ballybur Castle. This is also a great spot to make as your base and plan excursions - there are plenty of places to visit within easy driving distance (history, museums, Kilkenny, golf etc) and then you get to go home to your private castle (!). Very best wishes to Frank (owner) for making our visit such a wonderful experience.