We found Hillbrook through a Living Social deal. I'm so glad we bought it! The Inn was not that far from DC so it was easy for a weekend overnight trip. The grounds are so lovely and peaceful. I regret not having time to walk around them. We stayed in the Bamford Suite which was beautiful and quite spacious. No tub for soaking in that suite, just FYI.
We did the 3-course dinner and the food was exceptional. Breakfast, included with your stay, was yummy! The service was very friendly and welcoming.
Included in our living social deal was a $50 spa credit, so we made appointments for a massage and facial. Both were good services, but a little expensive.
One note, it is not a cheap trip, even with the living social deal. Gratuity and taxes for services still can add up. That is not to say we didn't enjoy every component of our visit, but just something to remember before you come visit.
Would definitely recommend Hillbrook to others and look forward to returning there myself. Hopefully in the fall or winter so we can use the big fireplaces in the main house!