I've been staying in the apartment for 6 times now, in different periods of the year, and I keep liking it a lot. It's a good size apartment with all the necessary facilities on a great location, 2 min walk from local stores and 5 min walk from the beach, 10 to 15 min to the center of Estoril and once on the beachwalk it takes you half an hour to walk to the center of Cascais wich is great. The apartment is located in a quiet, authentic neighbourhood with some nice restaurants nearby. It's perfectly suited for singles, couples or couples with 1 or 2 little children. The railway station is a 10 min walk away and in half an hour you get to Lisbon by train. One of my favourites is Sintra, wich is easily accesable by car, bus or taxi. Beautiful architecture and nature go hand in hand and it is a must to see.
If you're looking for a decent apartment with good price/quality, I can recommend this for sure.