@Angela3013 If you list it as a private room (and have 2 listings) then you are likely to have problems as with 2 unrelated sets of people one will make a mess in the bathroom or kitchen and the other will complain!.
You are far better off advertising as a two bed place for 4? guests. You could also have a second listing -a 1 bedroom place for 2 guests and lock the 2nd bedroom door if this is booked. This will allow you to capture two markets. If you do this you should link the calendars to prevent double bookings.