OK it's perfect. Quiet neighborhood, and walking distance from the center of Cascais and its beaches and restaurants and from the (bigger) supermarkets. Let's not forget you're only 20min away from Sintra or the crazy beaches of Guincho or Praia Grande.
The appartment is spacious, VERY well furnished with everything you need (incl washing machine, dishwasher and airco), the bed and sofa are comfortable, the internet connection is on fiber, and to top it all, Jorge is super friendly and responsive. It's my 8th time in Portugal and that was the best. 5 stars all the way!