@Laura4297
-If the room with the sofa bed is also used as a living room for all occupants, & has living room furniture, then I'd call the room a 'Common Space.' (The term Airbnb use on the drop down list.)
- If the room with the sofa bed is ONLY ever used as a 2nd bedroom, & never a living room, then you could call it 'Bedroom 2' - but still list it as having a sofa bed not a double/queen/king bed.
- Don't mislead guests into thinking you have 2 bedrooms AND a separate living room = 3 rooms! That WILL lead to bad reviews!
- Either you have 2 bedrooms & NO living room (Common space) , or you have 1x bedroom, & 1x living room = Common space.