I have stayed in many AirBnBs in various countries over the years, and this was hands down my best experience for a room in a shared house. The lady of the house is a real gem, she is an excellent interior designer, a great cook, an organized manager, and an exceptionally hospitable host. The house is so beautiful you actually feel sad about leaving it in the morning! Bedrooms are spotless clean and very comfortable, and the dining area where she serves a very nice breakfast is simply gorgeous. There is freshly-baked cake everyday free to have with tea and coffee at all times, and if you'd like something additional to the routine breakfast, like eggs, she makes it for you on the spot.
We absolutely loved our stay and wholeheartedly recommend this place to anyone who visits Sintra.