We loved this apartment. We were there with our two young kids (6 and 8) and they also enjoyed this trip thoroughly. Everything is really close (restaurants, grocery store, train station, bus terminal, and of course the beaches). It is a 5-10 minute walk to the beach and we did it everyday in the evening. The water was super calm.
The apartment was well equipped. Rita and her team took well care of us. They adjusted their check-in time to our delayed train arrival and gave us some tips for our stay in Cascais.