A furnished sitting room with sleeping accommodations (and some plumbing).
Also known as a bed-sitting room. A form of rented accommodation common in Great Britain consisting of a single room with a shared bathroom and lavatory, part of a legal category of dwellings referred to as Houses In Multiple Occupation.
A room providing a combined living and sleeping area with access to shared bathroom/shower and WC facilities.
An American-born Aussie replied, 'An efficiency apartment...
By London definition: a combined Bedroom and Sitting Room (hence the term 'Bedsit').