I was very satisfied with Isabel's room. As described, it is conveniently located close to the airport, without any of the troubles one would generally expect from such a location, like noise, to start with. I did not hear a single plane and slept the quiet night I needed to carry on with my journey the day after.
I did not have the chance to meet Isabel personally, as she was kept away from her home that day. But I had a very friendly welcome from her daughter.
The room is as described, and had I the opportunity to make another one night stop in Lisbon, I would certainly ask Isabel if she could host me again. So I definitely recommend her place.
Obrigado Isabel.