I was not aware that I had to pay extra money to the renter : andrea asked me to pay in cash 3 euros per person and per night in cash so 30 euros for 5 days for 2 persons), in addition of what I had already paid on airbnb website. so I paid in cash as I was asked to by andrea, but I think it is unfair because I was not told before the booking that I should pay this additional fee once in Venice. I think this should be written in the advert for the flat for more transparence.