I rather like the quaint little house at the end of the street.

Option D is the correct answer. 

"Quaint" refers to something that is attractively unusual or distinctive in a charming or odd way, which aligns with "unusual."

Option A: A "quaint" house might be old, but the word implies distinctiveness rather than being old.

Option B: "Quiet" refers to calm or peace, which is not what " quaint" implies.

Option C: "Haunted" refers to a place with the presence of ghosts, which does not mean "quaint."