Flat was very good and everything was in line with the description. Room was big enough for two, with closet and small desk. Bathroom and kitchen were very clean and nice, and the terrace was a nice addition for breakfast in morning sun. At last, but not least, the flat was 3 min away from Porto's best view point and greatest sunset place. You can access best vine caves within 10 minutes, got lost in the narrow streets knowing that your place is nearby. The main attractions of Porto starts within 15 minutes of walk. Overall great place to stay for "Porto experience".
For public transport it could not be easier. You can take a metro with one line change in the main station to get into airport. Trip takes 45 minutes.
Hosts were very responsive, there were no issues with the reservation at all.
Highly recommended.