Edwardian five
n.— «The apartment she chose was once an Edwardian five, which translates simply to a one bedroom for a rich bachelor or widow (probably not for a young single woman—they rarely lived alone in Edwardian times): only one bedroom but a preposterously large dining room and, of course, a maid’s room.» —“ Habitats/780 West End Avenue;A Buyer Who Knew Just What She Wanted” by Tracie Rozhon New York Times June 2, 1996. (source: Double-Tongued Dictionary)