When you create your listing, you are invited in the step "Price options" to indicate your base price per night for the entire place.
The price you mention must correspond to the price you are asking for the entire place, per night ! Please do not indicate the price per person per night.
Then, you can go in the "Calendar" and change your prices according to the period you choose, you just have to select the period and indicate your price in the rectangle on the right "Price per night for the entire place".
When the traveler is on your listing, he will be able to see the prices according to the nights by hovering with his mouse on the days of your calendar.
If you want to indicate the minimum number of nights according to low and high season, click here !