Amazing experience.
Isabel herself is very warm and friendly person that met us like we are a close friends. She gave us great recommendations about Sintra that we have found very useful.
The house itself is a fantastic place and the special point is the view that you have from the roof (where you also have place for breakfast, or just drink). You can see from one place: Sintra, National palace, Moorish Castle and the ocean.
Highly recommended.