Everything went very well, Carlos has been very nice and accomodating. The apartment is around the corner of Barajas square which has several bars and restaurants, but the street is very quiet. The apartment was very clean, comfortable bed and sofa-bed, and I can also confirm the wifi worked properly as I connected to several videocalls.
My only concern was parking as I had to park the car every evening, but it turned out to be fine just going around the block to find a slot.
I travelled with my mum and this was her first Airbnb stay, she was very happy with the result :) So overall, nice experience, thanks for everything!