This house is likely along Newtown Turnpike, south of Norfield Road, in Weston, Connecticut. In the early 1930s, Mrs. Mary "Mimsey" Benson was a member of a colony of artists and theatre people who lived around the Stone Brook estate of mining heiress Alice De Lamar. The residences in the colony were scattered up and down the western branch of the Saugatuck River. Mrs. Benson and Miss De Lamar appear in two other photos taken by Genthe, including the "alfresco" photo.

I see from my house by the side of the road,
By the side of the highway of life,
The men who press with the ardor of hope,
The men who are faint with the strife.
But I turn not away from their smiles nor their tears
Both parts of an infinite plan;
Let me live in my house by the side of the road
And be a friend to man.

http://www.essentia.com/book/poems/Roadhouse.htm

In the dictionary next to this entry should be Genthe's photo.