We have been booking Airbnb apartments in the Cascais area for many years now. It's our favorite region of Portugal. We have stayed in apartments in downtown Cascais, Estoril, Monte Estoril, Carcavelos, and Oeiras. Madalena's apartment is our favorite (and this is coming from all of us -- 2 adults and 2 teenage kids).
The apartment is beautiful. It's modern and bright and spacious. It is also well equipped will all necessary amenities (e.g., dishwasher, washer, microwave). And unlike the other apartments we have stayed in, Madalena's was a 2 story apartment which made it convenient when someone wanted to stay up late and others wanted to go to bed. The two outdoor patios had ocean views and were my daughter's favorite spots to read her books.
The location was amazing. It was walking distance to the beach and it was along the beach that has a boardwalk that runs into downtown Cascais. If you go further up to Carcavelos or Oeiras you don't have as lovely a boardwalk along the ocean. We couldn't ask for a better location.
And while we had a car, which turned out to be pretty easy to find parking in the neighborhood, there was a grocery store one street over that had all the basic necessities and had artisanal cheeses and pastries that were wonderful. There were also numerous restaurants within walking distance and train and bus stops nearby. So having a car would be optional in this location.
Finally, I can't say enough about the communications with Madalena and Maria (the property manager). They were prompt, considerate, and always helpful.
I don't have the dates set for our trip to Portugal next summer, but I will definitely work around Madalena's calendar in order to stay there again.