The best of the (sometimes bad) bunch
We took two of the tours offered by Hollywood Fantasy Tours, and both were excellent. Their offices at 6231 Hollywood Blvd, directly across from the Hollywood and Vine Metro station, include nice everything and lots of information. Their prices are very reasonable. Their vehicles (including the shorter open vans needed for navigating in the residential hills), were comfortable and clean, and their guides were excellent, particularly Bruce, who stopped and manoevred to get the best views through the fences and hedges of Beverly and Hormby Hills and Belair, and had carefully researched the homes to know who had lived there and when, sizes, features, and prices. They also offer a wonderful tour up Beachwood Canyon into the Hollywood Hills, where the stunning homes are readily visible and with incredible views of the Hills, Sign and Reservoir. I can't reccomend this firm highly enough. For more info, call me: Chris 204-772-8215. Their telephone numbers are 323-464-8184, 323-469-8184.
The streets in these residential areas are tortuous, confusing, and often sloping; it is better not to drive yourself and not get lost, while wanting to see somethng.
Try their Hollywood Hills Tour - it is really beautiful.