This is an excellent option for staying in Cascais. There are many places to walk to, including long walks along the water on the bike trail. Parking is easily available on the street or in the private parking lot behind the building. You will be given instructions on how to access that once you've checked in. The building is lovely and quiet. The unit has a very nice view of the ocean from the balcony. We had meals there when we ate in.
Across the street is a small grocery store that carried everything we needed and a terrific patisserie for all your bakery needs! Within walking distance are several very good restaurants. Communications with the agency representative were excellent as were communications prior to arrival.
We have been to Portugal several times and have always thought the Cascais area is the best place to stay. It's easy to get into Lisbon, to drive north along the coast for more beaches and hiking, and to the airport. We highly recommend Portugal Portfolio!