I was staying for 3 days in Napa and after careful considerations chosen Hilton and do not regret. I was hesitating at some point between Marriott, which is next door to Hilton and when I arrived to Napa the look of Marriott was more like a cheap hotel. So I liked the hotel stay with all standard features in the room: coffee, water, free wireless internet etc. The heater/conditioner in the room is very noise- this is really a downside and when you arrive in your room it is freezing cold - hotel did not keep the vacant rooms warm.
I did not like the breakfast - really very basic stuff and omelets that some people here praised. You're actually much better off with Whole Foods (open at 8am) which is just minutes away or Peet"s coffee, which next to Whole Foods which is open from 5-30am - it is important for jet lagged travelers!
A nice features are hotel has a small library, so people can borrow the book to read and when you "Like" them at Facebook - you'd be given a bottle of wine.
Room Tip: The top (third) floor is nice, quite and has some view.
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC