Wikipedia:
United Kingdom
In British usage, a studio flat has its own bathroom; a single room with cooking facilities. On the other hand, if a dwelling has a shared bathroom, it is known as a bedsit.
United States
A variation common in New York City is the "L-shaped" or "alcove" studio, in which the central room branches off into a small alcove that can be used for sleeping or dining.
Canada
Bachelor apartment, or simply "bachelor," is the common term in English Canada for any single room dwelling unit which is not a shared accommodation. A shared room, or particularly small bachelor, is sometimes referred to as a "bachelorette."