My two brothers, their families, and my Dad rented all three houses at the Wolf Trap Farm for a January weekend to celebrate my Dad's 80th birthday and had a great time. There were 13 of us -- so, we needed all three houses. This is not a luxury house but a working farm that was well maintained and welcoming. The setting on top of a hill overlooking a valley -- even in the dead of winter -- is idyllic.
The Manor House is the nicest of the three houses -- very cozy. We spent our group time there. The sitting rooms were too small hold everyone, but they made for very nice reading / game playing rooms. The dining room sat everyone comfortably, and the kitchen was large and well appointed. We used 3 of the 4 bedrooms in the manor house -- 2 of which have a private bathroom. The kids enjoyed the 4-bed bunk room. The hot tub, fire pit, and rope swing (conveniently adjacent) were also big hits and heavily used (tons of firewood). The servants quarters and pond house were also nice and could be self sufficient. The servants quarters are right next to the manor house, but the pond house is about 100 yards away -- flash lights are needed for an evening trek! There's a partially completed game room with fuse-ball, pool, and ping pong half way to the pond house that could be a real asset if it's completed (and heated!).
We absolutely loved the horses, dogs, and one potbelly pig(!) -- the staff that cared for them were real nice and accommodating to our kids. The owner also has a very detailed guide to area that was very helpful. We had one problem with the water during our trip, but the owner and staff very responsive and really worked hard to get everything working.