Maria and her family are really kind and helpful. Even though we arrived three hours later than check in time because of an endless queue at the car rent in the airport , Maria sent her daughter to wait us and welcome us with all the information we needed. Before our arrival Maria write us how to reach the flat, even directions on where to park the car (extra info: parking for free in Lisboa center for non-resident is nearly impossible, you have to leave the car in a toll parking really close to the flat). Also, Maria suggested us a bunch of really good restaurant where we can eat tasteful dishes.
In short, Maria's flat is really the perfect place to spend some day in Lisboa! Highly recommended!