This historical street was built in the 19th century and is governed by a neighborhood association. The association prevented it from the paving in the 80s and helped to maintain its original look.
It's currently one of the most photographed street in the USA, however, beware that it's still a neighborhood and people live there and all visitors should respect that.
Foursquare https://foursquare.com/v/acorn-street/4bcce1010687ef3b4717e0cc
Address 65 Acorn St, Boston 02108, United States
Coordinates 42°21'27.385" N -71°4'8.443" E