We family of 5 (2 adults and 3 kids) stayed for 10 days in this appartement and we would not rent it again because of some negatives.
The neighborhood is very nice, safe and quiet. The walk to the Carcavelos beach is about 20 - 25 min. There is a nice small supermarket 5 min walk, enough restaurants in the area. The appartement has 5 sleeping places but for us it was to small. I think for 4 person it's oke! The 1 person sofa bed needs a new mattress, it's too thin. The terrace is great for having your breakfast. The kitchen has all equipment you need. But the appartement needs seriously some cleaning. The bathroom and kitchen were not cleaned as it supposed. I had to clean it before we could use it (including toaster, glasses, plates etc. There are too much personal stuff of the owner, so there are not enough place to store your own stuff and it feels like you're staying there with this person.