Carla and Marco were excellent hosts - they let us use the flat as we pleased but were always available on WhatsApp for recommendations or directions. Carla met us promptly on arrival even though our flight had been delayed. The flat was clean and bigger than we had anticipated. Its very central location (all the big sites, bars and restaurants within a 10-15 minute walk) also makes it excellent value for money. Would highly recommend for a short or long stay in Porto.