A bit of a mixed review for this...
The ground floor and first floor of this villa are beautiful - bright and airy, air conditioned, as per the photos. The outside space is also lovely with a great pool, and the location is perfect for a 10 minute stroll into Cascais.
We had issues with the basement though - these rooms are of a completely different standard to the rest of the house, are dark and cramped, and have no air conditioning. We ran into some problems with the electrics and the plumbing in the basement and, even though they were resolved, we felt the rooms were just not safe enough or clean enough to have young children sleeping down there. We ended up having to move people out of the basement to other rooms, which wasn't ideal...sharing rooms with little people meant very little sleep was had!!
We had to get Airbnb involved to help resolve the issues and to assist in getting some sort of a refund for rooms that we strongly felt were just not suitable.
Overall, we had a fab time in Cascais but the issues with the villa caused quite a lot of unnecessary stress.