We stayed at Paulo's house for four nights with our two young girls.
The place was clean, more spacious than the pictures suggest, and very peaceful. Despite its relative seclusion it was also a great jumping off point to see the many sights in Sintra (tip: since you are so close you can go either early or late in the day when the attractions are much less crowded. For example we went to the Moorish Castle one hour before it closed and had no issues finding parking).
We highly recommend this accommodation!