I cannot say enough good things about this apartment. My husband and I spent five nights here, and we were so pleased with our stay.
We met Joana at the apartment, and she greeted us with hugs as she showed us around the place. She had purchased us a few goods--wine, juice, eggs, bread, fruit--so that there was some food in the apartment when we arrived (quite hungry).
It's ideally located for travel to Belem and Sintra, and getting to the city center is a piece of cake. You can take public transport, but we found that with two of us, taking a Uber places was more convenient for nearly the same price as the metro + bus (2-5 euros from most places in the city).
The terrace/sunroom is amazing, too!