We can heartily recommend staying at Casa d Sintra. Carlos was very kind to welcome us at the railway station and help us. He and his wife Helena are both very hospitable. The apartment was spotlessly clean and very well kept. It's small but very well organized and has all the essentials (including a hair dryer, an iron, all essential kitchen equipment, a coffee pod machine...). We were traveling with small children and were happy that there could be a cot and a box of toys. The location is very central, but this particular street is less busy that the adjacent ones, and since Sintra receives many one-day visitors and lots of restaurants close quite early, it's quiet in the evening, so no need to fear noise. Very much recommended.