Would love to see Boston added. (Most believe that Boston city planners used the throw-spaghetti-against-the-wall method of city planning.)
I've also stayed several days in SF, but did not quite like it as much as Boston.
In contrast, I've stayed 6 months in DC, which I ... hum ... did not particularly like.
OTOH, I do not miss winter in Boston. When they paved over the cowpaths, they didn't leave room for snow removal.