Just 45 minutes north of San Francisco.
If you're not in North America, first get to San Francisco. Then cross the Golden Gate Bridge and go north on Highway 101. Go past Petaluma, (the former chicken capital of the world) and take the Highway 116 West Sebastopol/Cotati exit. Go right one block to the light, turn right again and we are in the first block on the left.
Coming from Alaska, Canada, or points north. Go south on Highway 101, through Santa Rosa, take the Highway 116 West, Cotati exit, go left under the freeway to the light and turn right. We are in the first block on the left.