The Spanish Villa Inn was beautiful, and it is such a great location. It was very close to St. Helena (lots of great restaurants and wineries), but was off of the main drag, so it was quiet and serene, in a neighborhood setting. The room was spacious and incredibly comfortable, and the bathroom was large and beautiful. We stayed for 2 nights in June - the first (Thurs) there was only 1 other couple, the second (Fri) there were more people, but we never had problems with noise.
The owner (Roy) was great with recommendations for restaurants, and always eager to help. His wife makes homemade granola that is fantastic. For a B&B the breakfast is sparse (some fruit, granola, bagels, hard boiled eggs and cheese), but Roy did offer to make us other things if we wanted. It was fine for us, since you overeat in Napa anyway - a light start seemed just right.
There are several nice common spaces, including a bocce ball court and huge outdoor living area, the eating area (which feels like a closed-in porch), a library and room with big comfy leather couches and a TV. There is a great binder with reviews of local restaurants and lots of information on the local wineries. Our bed was so comfortable I almost didn't want to get up...until I remembered where I was. Every room has a private patio opening onto the lovely grounds. We would definitely stay there again, and would highly recommend it for a relaxing evening respite between wine tastings.