We were traveling with family of 16 and stayed in a Quinta for 8 nights.
Family included all ages between 5 and 79 and everybody enjoyed the stay.
Bedrooms are spacious with own huge bathrooms and they are all very nice, and almost every room has a beautiful view to the valley. So no conflict with family members to choose the rooms;-))
In living room upstairs (with piano!) there's maybe a biggest table on the hoods and we had a wonderful birthday dinner around it.
There is a proper kitchen in the house and you can self cater there but for this many people we only made the breakfast and order some food from the restaurants nearby when we needed some.
The garden, or perhaps you should say park, is beautiful and absolutely huge!
The main sights in Sintra are near by and if you are a hiker they are reachable by foot. There is a great short cut(uphill!) to Sintra center through the forest and narrow streets and it takes only about half an hour to walk to Quinta da Regalera. By car it takes 15 minutes to the beach. We had few rental cars and it was easy because there are no shops around.
All together it was perfect choice for us and Sintra and the nature around is amazing.
Thank you Ana and hope to see you again!