3027 Georgia Ave NW, which is about where the CVS at 14th and Irving is now. I assume this is the same Sholl as owned the much beloved Sholl's Colonial Cafeteria in the West End (near Foggy Bottom), which closed in 2001.
Quite the reminder of a time past, when cafeterias and automats were common. That said, I'd go to a cafeteria if there were one in the neighborhood and it was half decent -- inexpensive food and a wide variety. That's basically what Soho and those other pay-by-weight lunch places are these days.
The photo is from the Library of Congress and was taken by Theodor Horydczak. Here's the link to the Shorpy page.