I rent rooms in my house also, my experience has been that when you list two rooms together majority of my inquiries don't pay attention to rooms in shared house.
I still have my 2 room listings, but I also list the rooms separate for rental so 3 listings linked.
The shared bathroom for many is not a big deal as long as maintained.
Turn on the Airbnb New Listing Discount it really helps to get those first reviews.