We had such a lovely stay with our two children (2 months and 6 years old).
The host greeted us upon arrival (wearing a mask) and showed us the apartment. Communication was great and he responded quickly. We especially appreciated that we were allowed to stay a few hours longer on our last day as we had some problems with our onwards travel.
The apartment itself is very central yet in a quiet area. This was very important to us especially during the night to ensure a good night sleep for our children.
It had everything we needed, even some toys in the kids room and some baby play mats as well as a cot. The beds were all very comfortable and our son loved sleeping in the bunk bed. The washing machine was very handy and detergent was available as well.
The park was just a few walking minutes away, so was the beach and shops/restaurants. There are actually several beaches in walking distance. All were very clean (both sand and water) and not too crowded (so it was possible to socially distance).
There is a slightly bigger supermarket 10 minutes walking (within the train station) or a Lidl 15 minutes walking.
We would definitely choose to stay here again for our next visit of Cascais.