“Man and woman eating at table on front porch of row house,” Washington, D.C., 1924, by National Photo Company, via Library of Congress Prints and Photographs Division.
I’m sure that this photo was taken to illustrate an advertisement for the maker of that tub of cottage cheese on the table. (I can’t make out the name of the dairy company.)
You can click on the picture to enlarge it — then you can see that the couple are drinking their milk from wine glasses.
The location could have been in any one of several northwest D.C. neighborhoods — so popular in the city was the Wardman-style of rowhouse by the 1920s.
ADDENDUM: I found another photo of the same couple, here, having a picnic lunch in Rock Creek Park — again with plenty of cottage cheese.