I really enjoyed my stay and would have stayed in Cascais if the apartment was available for more days. The hosts are really wonderful, thoughtful and thorough. Everything I needed was there in the apartment. Things I didn’t even know I needed were there. They were extremely communicative and accommodating of my needs. I’d definitely stay again.
Other important info to note: the closest beach is about a 20 min. walk away. The city of Cascais has scooters but there aren’t any stations close by the apartment. There’s a bus stop not far from the apartment if you want/need to take the bus into the main area. There’s also a train to/from Lisbon that’s only €2.80. I recommend renting a scooter (their they have Lime, Link and Tier) and riding around the city and the coast.