Walkability, transit access, good local schools — San Franciscans clamor to live in neighborhoods with features like these.

Potrero Hill artist Wendy MacNaughton’s “mental map” of the city lists the strongest qualities of seven areas that stand out for her, among them SoMa’s “best transit access in town” and the “convenient, walkable, easy everything” nature of Lower Pacific Heights and the Fillmore area.

It’s no wonder, considering such characteristics correlate strongly with happiness. Unfortunately, walkable neighborhoods are a scarce resource in this country, which means living in one can come at a high price.

I spotted a copy of the poster hanging in the cafe at City Hall, where an employee pointed out that it was featured on the July 2010 cover of 7×7 Magazine, which commissioned MacNaughton to create the map.