IMPORTANT: The apartment is damp and has extremely high humidity, mold and probably asbestos. The smell of damp hits you the moment you enter the apartment and doesn't disappear even after leaving the windows open. This place is unsafe to live in, even if you don't have allergies or asthma. Close to the terrace you can see the mold growing in the walls, the apartment looks recently renovated so you don't see it in the newer layer, but it's possible it's also in the inside walls.
It's a shame because otherwise, the place is just like the pictures, very big, very well located and with superb facilities. Patricia refunded our full stay and I later found a review which had a similar situation which leads me to believe she's well aware of this situation.
We found another beautiful stay in Porto, for health sake, I'd highly recommend not booking here. Especially if you plan to stay for medium or long term.