F. Scott and Zelda Fitzgerald lived in the 18th-century house in Westport for six months in 1920. (It's been substantially renovated and added onto in the years since.) Barbara Probst Solomon wrote "Westport Wildlife," a fascinating article for the New Yorker (September 9, 1996) positing that Gatsby may have been inspired by an eccentric Westport millionaire. (Solomon's article is not available online.)
The Fitzgeralds moved to the house not long after marrying in New York, after stops at the Biltmore (from which they were thrown out) and Commodore hotels. A chronology at zeldafitzgerald.com notes that "they spen[t] a riotous summer [at the Westport house] entertaining their New York friends, including the influential American literary critic, George Jean Nathan. whose flirtations with Zelda annoyed Scott."
Ironically, the abstract at the New Yorker's archives mentions that one of the reasons writers and other artists flocked to Westport in the 1920s was because it was cheap.
photo of the Fitzgeralds' "honeymoon cottage" borrowed from William Raveis real estate