We had great time at the Filipe's house! The room and common areas were clean and nice. The kitchen was fully equipped for some cooking. We could also make some coffee and tea which was great. The communication with Filipe was swift. He gave several helpful recommendations on what to visit and what was nearby.
Be prepared, the house is located not in the historical part of Sintra but further away (~2 km). If you walk along the railway, the way to the city center is flat.