We really hit the jackpot with this flat! It is very large with massive 10' high ceilings, giving it a very spacious feel! We loved the quick walk to the beach and the long boardwalk all the way to Cascais (Try the e-scooters! They are awesome!). The flat is close to restaurants, stores, and the train station. Everything is walkable; no car required!
Rosario was kind enough to leave us with some beach toys, towels, and an umbrella too.
The flat is mostly below grade, which helps keep it cool and quiet. There is some noise from the street, walkway, and train but everything is at different levels so it didn't bother us (4 adults, 2 young kids) nearly as much as we thought it might. The upstairs neighbours are sometimes audible but not too bad.
One thing to note is it is not really road accessible. The nearest parking / drop off area is down some stairs and up a ramp, near the "Level Up Fitness" across the walkway. You'll have to carry bags up the stairs.
Overall we loved it. The neighbourhood is friendly and not tourist-y at all. Convenient and a great find for families or groups that need extra rooms! Would consider staying again.