Stayed at Villagio in January during a vacation in Napa. We love the town of Yountville and the location of Villagio. The room was nicely appointed, the bed super comfortable and the bathroom was roomy.The room did have noise due to the a/c heating system but we did not hear the traffic noise that others have mentioned from 29 even with our location being in the back of the property. It was in the 60's so we were able to take a quick swim since the pool is nicely heated.
The breakfast is a big plus, it is a great idea to start wine tasting with a full breakfast behind you. A number of days we didn't need lunch due to the excellent breakfast.
The location makes it easy to wander Yountville and stop at some tasting rooms and shops without needing your car.
Having Bistro Jeanty just across the street was a definite plus for my wife as it is her favorite.
The only downside is that it seems that the property especially outside is starting to need some renovation.