Word of caution if you are thinking of using the Booking.com taxi service between airport and accommodation, especially if outside normal working hours. I had a confirmed booking to Porto airport at 5am. Driver and car never arrived. Telephone contact number an answer machine only in the Portuguese language. Not easy to find an alternative taxi that time in the morning. Only just avoided missing the flight. Contacted customer service when arrived home - distinct lack of genuine concern and appreciation of potential consequence of missed flight. I paid through the nose for alternative taxi but it’s not about the money. It’s about reliability and trust. No thanks, I don’t want 10% discount on my next booking because there won’t be another booking, neither taxi, hotel nor any other service that you offer.