Hi,
I noticed on your listing your price per night is fixed for 2 guest, and you add USD 13,- for the 3th guest (I did not select dates, so it's what the listing tell me in general). Your listings sleeping facilities show me 4 guest can sleep. If these excisting facilities are OK to the guests, why charge USD 20,- for the 4th guest instead of USD 13,- ?
Is there extra work for you involved (like bringing in an extra bed or similar) ?
You can change the booking afterwards by putting in the amount of guests and the correct price. The change will be sent to your guest to confirm it. Or, if not allready having a confirmed booking, sent your guest a special offer.
Best regards,
Emiel