We used the apartment of Charles as our starting point for different tours to the beaches nearby, Sintra etc. the area is very beautiful but you need to consider that it is usually 5-10C colder than Lisbon and also it was very moist and foggy most of the time during our stay due to the windy Atlantic coast nearby. On the other hand the apartment is very close to some amazing beaches.
The apartment was in very good shape and clean but very small (~15qm). We travelled with a baby and the room was a bit too small for that. So we wouldn’t recommend going there with kids. Especially as the weather didn’t allow to use the nice terrace outside.