We stayed in Healdsbug for our time in Sonoma Valley and now prefer it to the town of Sonoma--fewer tour buses, closer to many wineries, great restaurants.
We stayed at the Camellia Inn, a B&B with excellent breakfasts. Each room's door opens to the outside and I think this helped reduce the noise you usually get in those old homes.
We admired the beautiful homes and amazing gardens. The guy who lives in the first home below wanted to chat about his garden, world affairs, and anything else we would hang around for.
The Dry Creek General Store was certainly the place to be. They were filming a Food Network episode the day we were there.