We highly recommend staying at Rita's apartment. The apartment has everything that you need. It's nice, cosy, clean and comfortable. The city centre with it's nice historic sites and good restaurants is within walking distance. The railway station with a direct line to Lisbon and bus stops for seeing the castles and palaces are within walking distance as well.
Rita is a wonderful host who speaks perfectly English. She is a Sintra native and she will hapily share her knowledge about the historic sites and the best way to visit them. She also knows the good restaurants away from the touristic crowds.
We had a great time in Sintra.
Marc & Marjanke van Ommen