Vicky - My quick response is that it is one of the few areas where pedestrians rule! It is such a popular area for young families that cars wait at each 4-way stop to let the stroller, Mom, Dad with Bjorn holding baby,and golden retriever cross, one after another, after another. : )
But seriously, there is a great variety of family friendly restaurants, (with organic options), shopping, grocers, and lots of great little parks. It also tends to be sunnier than other areas of the city. Finally, in the last 10 years many of the homes have been remodeled into TIC (Tenants in Common) where smaller families can afford to start off with a nicely re-done flat. There are several great pre-schools in the area and it seems to have simply become the "in-place" to reside.