bedsit vs studio flat

bedsit

noun
  • A form of rented accommodation consisting of a single room for use as both sitting room and bedroom; there may also be a small kitchen area and washing and toilet facilities, but these amenities are more commonly outside the room and shared by several tenants. 

studio flat

noun
  • studio apartment 

  • Hollywood flat 

How often have the words bedsit and studio flat occurred in a corpus of books? (source: Google Ngram Viewer )