My Channel Manager wrote me:
Airbnb XML now supports room types with multiple rooms
Airbnb have recently officially opened their portal to Hotels, B&Bs and they now support room types with a quantity greater than one. Previously each Airbnb listing could only be for one unique room.
It is a good news for who is creating his listings now... but not for those who have been on airbnb for a long time and have different listings for the same room type. In this case, you have to choose which listing to take on, renouncing all the reviews you have on the others because it is not possible to merge different listings.
So: Double Room A (100 reviews) + Double Room B (80 reviews) = Two Double Rooms (max 100 reviews)
We have to ask Airbnb to allow us to combine our old different listings. Otherwise, only hotels will be able to manage availability in an optimized way.