A lodging rents 3 rooms. These three rooms are rented individually as B&B room or all together as a flat. The flat is also offered as house (the house and the flat are really the same).
To set this up you will need 5 rooms in {{#fas:cog}} (SETTINGS) PROPERTIES > ROOMS.
*House
*Room 3
Go to {{#fas:cog}} (SETTINGS) PROPERTIES > ROOMS > DEPENDENCIES and set:
*Rooms: set ""Include Bookings from" = Flat and House