Hi @Cecila0
You are on the community boards here - not airbnb customer service - just a forum for hosts and guests to share advice.
Re your question, there is no set answer - every host sets up there listing differently.
For example my base rate is for 4 guests, and every guest thereafter incurs and extra guest charge.
The easiest adn best way to find the actual costs for a trip is to enter the number of guests who will be using the accommodation when you do your initial search. All the properties and the prices you are then shown will inclusive for that number of guests. YOu can then compare different listings knwoing that the price you see will be the final price.
Hope that makes sense and is helpful
Regards