I chose Isabel and Alberto's place as it was situated between the coast and Sintra. The house is a very pleasant environment. Our room was comfortable too. The area is very scenic (you can see the castles on top of the hills) and the house itself is quiet. Alberto was very helpful both as a host and also beyond that. If you are without a car then make sure you get off at Portela station as there are buses running longer from there. I did manage to walk from the house to La Regaleira in the morning at a time when there were fewer cars. Good to give yourself more time to explore the region.