We stayed for 3 nights in Luis flat. It's very small and nice, perfect for two people. We found there things we needed the most, like clean towels, boiler, coffee maker, also some excellent coffee. The flat is located perfectly in the center of Sintra. Teresa picked us up from the train station and took us to the flat, also showing us the surroundings and told some tips about where to it. We recommend this place!
The only bad side it was the humidity in the room, because of the rock wall in the back of the bed. The dampness makes the ceiling falling down in the bed a little.
Overwall it was a good accomodation!