We are a family of 4 with 2 children of 5 and 8 years old. Whilst the amount of space inside the house was just enough, we obviously went to Estoril to be outside.
We found the area extremely well located to do : and a city trip to Lisbon and Sintra/Cabo da Raco, and it was reasonably quiet at night.
Idalina was a very nice host offering us some basics to start with for the first day ! Definitely recommendable if you are going to Estoril to be outside and have a solid centralised base.