One of best experiences on Airbnb I have made - Madalena and Carlos were lovely, open and bright people offering their charming place for a really great getaway.
Sintra in August is not really for the soul seeking, taciturn traveller, more for the "got this on my checklist and just waited 2 hours in line"-type of tourist. Nevertheless the place was wonderfully quiet (except when the neighbours dogs had a bad dream) and the perfect base for circumventing the plethora of tourists in the village (again, talking about August). You will find a neat and cozy home for the time.
Madalena had many invaluable for places to see and to eat. We we were offered homegrown fruits and vegatables, a recipe for a local pastry and even freshly cooked marmelade.
If you have the chance, go for it. There are scenic beaches, wonderful walks in the forest or the shore, dream-like gardens, ambrosial food and some breath-taking views.