We stayed in this apartment for two weeks and loved it. It's a very comfortable and nice place to stay during your vacation in Cascais. It is some 15-20 minutes walk from the beaches, city center, shopping center, railway and bus stations. The flat is fully equipped, has kitchen with microwave and coffeemaker and washing machine etc.
The host is very friendly and helpful and even gave us a ride to the airport when we were leaving.
I would recommend this apartment if you're looking for a big, cheap and calm place.