Arbor Guest House is lovely-- Dan and Candy (the proprietors) are consummate hosts. :)
You mention your sticker shock-- for anyone visiting Napa, this is suggested reading:
B&Bs w/rooms w'a view of vineyards (or even just country fields) typically run around $600-3000 per night during peak seasons (esp holidays). Please note that the prices we just gave count in all of the costs associated w/a stay (ie, taxes, surcharges, breakfast, coffee, etc). Too many folks book a room based on rate, and then get even BIGGER sticker shock when they check out, looking at all those extra charges (often adding as much as $60-200/day per couple).
A cautionary tale:
First time visitors to the Napa Valley imagine getting a room with a vineyard view, birds singing (cue up some Mozart or Debussy), and crickets chirping at night.
What they *don't* count on is:
-Cars zooming by on the highway 300 feet away
-Tractors rumbling through the vineyards at 4 am
-Smudge pots billowing smoke into their room at night
-Large fans (made from old aircraft engines) that turn on when it gets really cold, to circulate the air (think low flying bomber, and you've got the sound right).
We're not being melodramatic, or exagerating--when you buy a home in the Napa Valley, you literally need to sign a document that says you understand that this is an agricultural community, and that you are agreeing to live in a place with are associated agricultural smells, sounds, and other things (really!). :)
You can certainly book a room up on the hill, at a place like Poetry or Au Berge-- they are far enough away from these things so as not to be intrusive.
But the big "shocker" for some who imagine that pastoral bird-singing tableau is the actual, nitty-gritty down 'n dirty nature of farming grape vines.
For this reason (and others, primarily the Ag Preserve Ordinance), most lodging facilities (hotels, motels, Inns, B&Bs) are in towns like Napa, Sonoma, St Helena, Yountville, and Calistoga.
And as crazy as it may sound, the noise "in town" of some cars going by at 25 mph is actually a lot quieter than being out in those vineyards, some nights!
Add to that the convenience of being able to walk to dinner (if you're staying at a place in town), and you now know why most folks who visit the Napa Valley wind up staying in one of the towns mentioned above.
Reading the TA reviews for any hotel/B&B/small Inn can be a big help in planning your trip.
But bear in mind that Napa's B&Bs have some of the highest TA ratings of any Inns in the world. In fact, the top 30 B&Bs in Napa Valley ALL rank higher than the number TWO hotel in Napa (ie, have average ratings more than 89% positive). So take that into account when sorting though all your choices!
We hope you have a wonderful visit to the Napa Valley. It's a very special place. :)
Napa Old World Inn