We really loved staying at Mars' house! It's a lovely large house, run in a "real" B&B style - with a nice continental breakfast buffet for all the guests, put on by the housekeeper each morning.
The room is as pictured - a nice simple self-contained space, with a beautiful bathroom and all basic amenities in the small kitchenette. Perfect for a couple on a short (or longer) stay.
Location-wise, it's nicely tucked away from the busier/noisy parts of Cascais, while still being close to the beach, good restaurants as well as the train station.
"Nice touches" included providing beach-towels / umbrellas for our stay, having a large and beautiful bathtub, and always very good communication with Mars.
I would definitely recommend staying at Mars' house in Cascais.