I've stayed there a number of times, as it's on a portion of the battlefield that I have studied extensively.
Part of the house is historic, and was there at the time of the battle. There's also a large addition put on in the early 1990's. Once upon a time, the innkeepers--Charlie and Florence Tarbox--put on regular demonstrations of cavalry tactics as well as artillery, as they had their own reproduction Parrott gun. The couple has since divorced, and I have no idea whether Florence, whom I believe now owns the place alone (it's possible that she has sold it--I don't know), still does the demonstrations. Since she and Charlie got divorced, I haven't stayed there, largely because Charlie is a friend of mine. Charlie was enormously helpful to me when I was researching my first book, and I feel a sense of loyalty to him, which is why I no longer stay there. My decision not to stay there any more has nothing to do with the place itself, which always was delightful.
I think that you will enjoy the place. The fact that it sits right on the park boundary means that it's very quiet, and it's hard to beat the historic milieu.
EDIT: from the website, it appears that there has been another addition to the inn, and that it's now quite a bit larger.