This is a fantastic apartment in a really great neighborhood, not touristy but very convenient to all parts of the city either walking or trolley. A wide variety of restaurants, tascas, pastellarias, markets, and bars frequented by neighborhood people.
The apartment is perfectly situated, has tons of windows and wonderful light, good plumbing and shower, great air conditioning and very comfortable (firm) mattresses. The only negative is that the internal walls are relatively thin, such that conversation or calls in one room can usually be heard in the others, even with the doors closed.
Also, while Maria and Pedro are good hosts and very helpful, they are often not prompt in responding to messages, so plan to reach out well in advance and perhaps multiple times to get your question answered.
Overall, this was a great experience and we will absolutely stay here again when we return to Lisbon.