This is a fantastic place to stay during your visit to Lisbon!! We stayed as a couple for a week and it was perfect for our holiday. The apartment is even better than the photos show, it is beautifully furnished and had everything we needed for our stay, with the balcony perfect for breakfast or a pre-dinner drink. The bathroom and kitchen were new and clean and the building and area was friendly, in a nice neighborhood and away from noisy streets and tourists. The air-conditioning is silent and works.
It is easy to reach all the tourist sights, the bus/train station is just 2 minutes away and has services into Lisbon and out to Belem and Cascais. However you can walk to Baixa as well, it is easy and takes around 15 minutes. The neighborhood also has grocery stores, cafes (La Boulangerie!), a few bars and restaurants so you don't have to go into the city center for everything.
Edite is very welcoming and motivated to make your stay enjoyable, she has lots of tips and is always available to answer questions with a quick reply. She was also in the apartment when we arrived to show us around and help us settle in.
We can highly recommend this place and would stay here again anytime.