If you want to visit Sintra, you definitely have to sleep here.
The appartement is nice, clean and ideally positioned inside the Sintra village. Maybe a bit cold in winter, but a portable heater is provided.
The guests are very kind and welcoming (the gave us some guides and maps of the touristic places of Sintra, in French language) and will give you plenty of advice (like for local pastries).
We will definitely recommend this place.