Excellent stay with my family (two kids - ages 8 & 10). They LOVED staying in a windmill! The host was lovely and checkin/out was super easy. The pool was great. The nearby beach was lovely - low tide is the time to go. And there’s a great beach cafe with cheap beers and food. We walked one day - an adventure! (Drove the other days).
There were some mosquitoes, so come with mosquito spray for you (my only “complaint” and I don’t think that’s an accurate word…)
Close to Sintra. Ericeira is about 25 minutes north and a great beach town. We ate several meals at nearby Dona Azeitona - great Italian food and a waiter (George Silva) who was one of the loveliest people we met on the entire trip.