We stayed for a week in September with my husband and our parents. We found the place far beyond our expectations, much nicer than what the photos show! The appartment is clean and well furnished. The balcony has a beautiful view towards the Sintra palace. location was one of our concerns at the time of booking -we were originally looking for something closer to the historical center, but opted for the station because of the access. As it turned out it was not a trade off at all. The place has Sintra's misteriois ambience with small streets just backdoor, is close to the station and bus stops, but away from the major tourist crowds. The historical center is in 10-15 min walk distance only. We were also worried about the proximity of the train tracks, but that wasn't a problem. Train in that area passes inside the tonnel, once in a while we might have heard a low frequency sound, like if the subway was passing, but I barely remember noticing it at all for the most of our stay.
Alexandra was a great host and even gave a lift to Estoril and back when we needed to meet friends there.
We loved Sintra and our appartment and wish we can come back one day!