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studio apartment ['stju:dɪəuə'pɑ:tmənt] stresses
gen.	квартира-студия (elenajouja); квартира гостиничного типа (Liv Bliss)
amer.	однокомнатная квартира (In general in the USA, the term "studio apartment" denotes a slightly larger apartment, typically with a separate kitchen, dining area, bathroom, and often an alcove and/or walk-in closet(s), whereas "efficiency apartment" indicates a one-room apartment with a kitchenette built into one of the walls, but typically still with a private bathroom, as opposed to one shared with other tenants.); гостинка (Telecaster)
construct.	квартира-студия (без перегородок между комнатами); однокомнатная квартира; студия
slang	однушка (generally, a one-room apartment; can be slightly bigger or a lot bigger than a studio, depending on where you're from SirReal)