We had a great time staying at Luisa's 'Casa do Patio'. It's a lovely small apartment with a great patio/terrace attached.
Luisa was lovely, helping us with suggestions for places to go and eat and sites to visit, and on our first night whisking us from the airport to a fabulous local restaurant in a village near to Sintra.
The apartment is very central to the main 'Centro Historico', just a couple of minutes walk, but it's also very quiet and secluded.
It's a perfect base for exploring this amazing area and Luisa is a warm, helpful and friendly host.
We would recommend.