Great place to stay. We went with a group of 8 adults and 2 children aged 3 and 5 for 4 days of skiing. Hot tub is awesome after several long days of skiing. It's easy access to Killington and Pico, I believe it was 8 minutes to Pico and probably the same to Killington but we went to Skyship gondola about 12 minutes away. Can't speak to much other local stuff because most of our time was spent hanging at the house or skiing. Plenty of room in the kitchen to cook meals, Dinning room table only seats 6 but it's an open area with the upstairs living room so unless you're really into formal dining it's not an issue. The upstairs has a living room with traditional log fire place with plenty of wood in the storage space outside if you're into that classic wood fire thing, easy area to gather with the adults. The youngest of our group loved the tree house but the basement gathering area is perfect for teens or young adults who want a different vibe than the old adults who gather around the kitchen and main living room.
Having 3 bathrooms is great, basement one has a cold floor so bring slippers. (It was also unusually cold when we were there, wind chill of -30. Probably more cold on the floor than typical, also made it interesting having your hair freeze while in the hot tub.)
Tree house is awesome, There are 2 levels to it, the top is super cold but had a DVD player/TV, the lower level has the heaters but and a TV with cable. Wifi works great out there so we just plugged in our firestick and watched Encanto (again) and had snacks.. there is a slide on the outside of the tree house that is pretty epic with the amount of snow.
For more family entertainment the owner also has sleds, DVDs, and an x-box available. We didn't get to use them as we were only there 3 nights, but this place would have been great for a longer stay.
Great location, great amenities, and a unique addition to the home.