We stayed with our two daughters (aged 5 and 7) and it was just what we needed. It was bright, modern and very clean, and the location is great. You're about a 7 min walk from the centre of Cascais, and in a few more minutes you can be on the beach. 25 mins to Lisbon by car.
Sonia, who was our host, could not have been nicer, and was really excellent and speedy in her communication. One note: the showers are very small, which is something to consider if you any larger than "average".