We stayed at this apartment the night before our flight back to the United States. We were returning to Lisbon from the Algarve district and decided we wanted to be closer to the airport. Earlier in our trip, we had stayed in the Bairro Alto district. This apartment is very convenient to the airport and would recommend it if proximity to the airport is your goal. But it is in a more "downtown" area - like around office buildings - so I would not recommend it if your primary goal sightseeing around Lisbon, although it is extremely close to a metro/train station; so you probably could get around the city via metro/train fairly easily. The apartment is on the 3rd floor (three above ground level) but the building has a small, old elevator that was very useful in getting our luggage upstairs.
We didn't stay long, just 6 pm to 8 am the following morning; so we did not spend a lot of time in the apartment. But it is quite large. You could fit a family of 7 if you were so inclined ... double bed in one room, two twin beds in two other rooms, and a child-size bed in the back bedroom through which was the second bathroom.
Maria was very accommodating and helpful.