Elsa and Rui's place is great!
It's located just off of the Avenida so you are in the heart of city close to grocery stores, metro, great restaurants, and theaters, but it's a few blocks away so you have a more residential feel to the accommodation.
I was remodeling my apartment in the city and stayed here for six months so my experience might be a bit different than the average traveler. The kitchen is large and bright with everything you need to cook and feel at home. The best part of the apartment is the large terrace - it is a lovely space to take coffee in the mornings or to sit outside at night with a glass of wine.
Elsa and Rui were great to work with - super responsive and professional and just really kind and helpful people.