The family life fundamentals of neighborhoods like West Portal are strong and always have been. You can tell this is historically true by the long-term presence of the streetcar straight to downtown. They are also provide easy access to the Peninsula. It makes sense that homes in these areas are finding an audience with people priced out of Cole Valley and Noe Valley.
http://blog.sfgate.com/ontheblock/2014/06/24/is-west-portal-the-new-noe/#24398101=7&24472103=9