@Jennifer1448 You'd have to create 3 listings, one for each 4 person rental and one for the entire place. Of course, you would only show photos on each listing of the rooms available for that listing, and the other info, number of beds and guests. Then you'd link the calendars so if one or both of the 4 person listings got booked, the entire place listing would be unavailable. Don't ask me how to do this, I never have, but the info should be available on the site in the Help pages.
It would be important to make clear on the 4 person listings that there is another similar unit attached which may be rented to other guests, but that they wouldn't be sharing any rooms. If they'd be sharing outdoor spaces, make that clear as well.