Actually, if you are concerned about the sun, the closer you live to the beach the better, as the marine layer keeps it cool and the sun only is strong maybe July thru September.

As for Napa, the weather is similar to Tuscany, yes, but there isn't much of a population concentration there. The largest city in that area is Santa Rosa in Sonoma County. If you were visiting that area every few months, you might make some clients, but most of the people there probably go to San Francisco for their fun, and many of the people on vacation in Napa or Sonoma are with "family".

I am not aware of the Napa Valley being a location that would prove financially productive for a provider. The city of Napa and other surrounding cities are small. Great place to live but I don’t think you are going to get a lot of business. Mostly couples (I have taken many girlfriends) go to Napa. Once in awhile you will have a guys weekend. You are better off working in and around San Francisco.

It's actually cooler nearer the beach. I'd look in Santa Monica, some areas (not all) of Venice and Marina Del Rey. All are pretty convenient for "incall." West Hollywood is considered one of the safer areas of L.A. probably because it has a large gay population. Sherman Oaks in the valley is convenient 'cause it has pretty good freeway access. Some ladies prefer Brentwood, again nice area and fairly safe.

All of the above are just one Angelino's opinion.