Spacious well-appointed home near SF to trade for space in London!

We have a nice, spacious kid-friendly home in a idyllic suburb over the Golden Gate Bridge from San Francisco - It is a short car or bus ride to a ferry that takes you directly to the fantastic SF Ferry Building where you'll find any/all manner of public transportation around SF and over to the East Bay (Berkeley).
We are centrally located for trips to the wine country (Napa Valley & Sonoma), Mount Tamalpais, Point Reyes seashore, amazing Farmer's Markets and many quaint towns here in Marin County.
My husband will be working (for Apple Computer) in London for much of July - My two (well behaved) sons and I would like to join him for that time and would prefer a home to a hotel for a stay of that length.
Our house is two levels - It is quite large and very clean and well appointed - All manner of wireless and cable access are provided as well as a housekeeping service every other week.
We are currently finishing construction on the downstairs level where there is a playroom, spacious guest bedroom/bath, laundry room, workshop and home office.
Please contact me if you are interested and I will gladly provide pictures or a video walkthrough.
Thank you!
Heather