Maria's place is very nice, the room is a bit on the smaller side but we really liked it. Felt nice and cozy. Her son Antonio met us there, he was very nice and welcoming. He provided us with plenty of coffee and even nice wine.
The room is located very near the Areeiro Metro Station where you can use the Linha Verde, this line takes you directly to the Praça da Figueira in the center or Lisboa, and also connects with the Linha Verdelha that takes you to and from the airport.
Overall a great experience and if we have the chance we'd stay here again!