@Fabrizio284
I can't see your listings, did you pause them?
What is the layout of your apartment, are both bathrooms attached to the rooms or your guests have to cross the common hallway to come to the bathroom and back?
Do they have any shared places like the kitchen?
I am asking because we have a big apartment divided into two separate apartments. They share the front door and the small hallway. Both apartments have their own doors, kitchen, and bathroom. This way we can rent each apartment separately or together as a big one for bigger groups.
We linked our calendars so the listing for both apartments is automatically blocked if any apartment is booked and vice versa.
We have a higher occupancy rate for the bigger (2 bedrooms) apartment where we can host up to 6 guests, than for studio for 2 guests because there is an oversupply of studio apartments in our city. For 2 bdr apartment, we have a base price for 2 guests and charge additional 10€/night for an extra guest. Often, 2 guests will book 2 bdr apartment because each guest wants his own room but our average group is 3-4 guests. So yes, many people travel in groups of 4+ people. Some of them are family and some are friends so even better if you have a combination of single and double beds.
If you want to max your revenue then set the base price for 4 guests as others suggested, or, if possible, divide the apartment into 2 separate studios.