In the apartment from Paula you feel emediately, that this is her home. It is well equipped, absolutely clean, full of comfort and one could stay a very long time there, feeling at home (with a great kitchen, big bed, eating place in the kitchen, living room with TV, elevator to 4th floor, extra key to your room).
The beach for servers is very close and the bus station and Metro easy to reach (150 m / 400 m). One should take Bus 500 to the centre (20 min) because it is very scenic all along the coast. This is by the way a great walk, too (4 km until the Douro flows into the ocean).
Restaurants and supermarkets are nearby and Carlos (Paula's brother) explained to me all I wanted and needed to know.
From the airport I took a taxi (the best way to find it for the first time) but than always public transortation. Interesting: Numbers of houses in Porto show the dictance from the beginning of that street (888 m from beginning).
In the apartment there is a second room for guests an I had great company during my four days. I ran the marathon of Porto and the house is 100 m from the finish... so even the best possible place for this event.
It was a great time there, thank you to Carlos and Paula.