The phrase "efficiency apartment" is correct and usable in written English.
You can use it when talking about a type of apartment which is usually small and contains basic amenities. For example, "My sister was able to find an affordable efficiency apartment close to her college campus."
Ms. Horta and Mr. Fernandez live in a small efficiency apartment.
She said that they were staying in an efficiency apartment, with a cot for the boy.
He lives on Social Security in a Cambridge efficiency apartment that is about four times larger than his cell.
After he and his wife, Madeline, were married 22 years ago, they lived in a 525-square-foot efficiency apartment.
He never moved from the one-bedroom efficiency apartment in Manhattan Beach he had had since his U.C.L.A. days.
My efficiency apartment had a bedroom with queen bed, sitting room, a fully equipped eat-in kitchen, and a tiled bath.
Tells about a program in Denver that provides subsidized efficiency apartments for homeless people until they can stabilize and find jobs.
It is now a gilded single-room-occupancy hotel that is considerably more than a renovated building with efficiency apartments for 416 low-income workers, formerly homeless individuals, people with AIDS and the mentally ill.
Compared with these weaverbird cities, the main rest camp at Twee Rivieren is modest: a thatch-roof main building, a gasoline station and a few dozen square cottages, furnished like efficiency apartments.
The birthing unit had been closed because of quality-of-care concerns, the bathrooms could not accommodate wheelchairs, and recruiting efforts often died as soon as, say, a nurse from out of town saw the drab efficiency apartments set aside for the staff.
The yacht club, established in 1952 on an estate designed by Stanford White, was given the right to build the residences -- efficiency apartments that would be leased to members from April 1 to Nov. 1 annually -- in a 1985 rezoning plan, said Mark C. Zauderer, the club's lawyer.
