The hundreds of previous reviews (which I've read) shared pretty much all you need to know about this quite lovely hotel, however in spite of my comprehensive effort to find a consensus among them as far as the best room location choice (which varies exceptionally widely within the property) I was unable to come to any conclusion prior to my visit. Thus, we just took our "Premium" room as assigned, which was at the very far end of the property, upstairs and facing to the East (#1006.) Unfortunately, these East-facing windows (and French Doors) iluminated a definite weakness in the otherwise lovely room, which was that the large (quite stylish) blinds, when closed, still allowed into the room (and the immediately adjacent bed) tremendous amounts of ambient light. While only mildly disconcerting during the evening (with parking-lot security lighting providing subtle illumination into the room) the mandatory "Sunrise Service" first thing in the morning meant that sleep was basically over at sun-up. Unfortunately, when coupled with the unusually high level of traffic noise from the very proximate CA-29 (exacerbated by this particular room's unique location, angularly open and unobstructed to the highway) suffice it to say that our days simply started well before we had planned.
However, knowing what I now know, I can say that a vastly superior experience at Hotel Yountville can likely be obtained by both staying on the first floor on the backside of the property (thereby allowing the front row of the property located closer to the highway to serve as a sound breakwall) and electing a room that does not face the rising sun (thereby reducing or perhaps negating the weakness in the blind design.
And having conquered those minor anomalies, prepare yourself for a wonderful stay, with fabulous service (never approaching the pretense that others have occasionally demurred herein this Forum) with outstanding breakfast and lunch cuisine amid secluded and lavish ambiance. The location is within ideal walking distance to everything, including the fabulous Redd and Bistro Jaunty, both of whom created indelible memories for my wife and I over our very brief stay. Moral of the story: Get the right room (for you) and enjoy Hotel Yountville.