Yes the nightly price is the same but you have to take into account the number of nights plus the additional fees, total that amount, then divide and it will not be the same as your advertised base nightly rate pre fees. The only way it should remain the same rate per night as you base rate is if you do not have any fees whatsoever, no cleaning or extra guest if chosen.
So for the listing 'You just must book it!! balcony *Old Town 7 min, below are the different rates you would be charged per night for the same property. These are not approximate prices as you mention below, these are average prices which is different.
2 nights would be £43 per night (£35 base rate x 2nights = £70 +£16=£86/2 =£43)
4 nights would be £39 per night (£35 base rate x 4nights = £140 +£16=£156/4 =£39
6 nights would be £37per night(£35 base rate 6nights = £210 +£16=£226/6 £37.6 rounded up
Your base rate £35 is not affected and the guest is not charged more. It is just averaged out over the nights book plus additional fees. Basically the less nights booked the more expensive per night and the more nights booked the less that nightly rate. It will appear as if the rate per night is higher as evident above
Your guest will be charged more than you see because they will have Airbnb guest service fee added which won't show on your end.
This is how the rates are calculated, try using the above format to manually calculate for yourself the total invoice based on the number of days your guest has booking, plus any additional guest fees plus cleaning fees, if it doesn't add up still, then I would suggest you contact Airbnb directly as there may be glitch.
