We entered the apartment and right away felt comfortable in this bright, airy place, although it could be classified as a "regular Airbnb apartment" with a bit too much plastic fake wood for the interiors.
Everything you need is within walking distance, we very much enjoyed hanging out in the nearby park, especially on a Saturday morning when there is a small market and lots of easygoing folks. Also nightlife is close, but far away to be annoying. The only downside are the traffic noise during the day and the smell coming from the hamburger store downstairs.
Sérgio and his staff were super friendly and clearly made an effort to meet our needs. For a short stay in Lisbon we can definitely recommend staying in this apartment.