Parking for Free!
Regarding Parking, I would like to let you know that Historical Sintra was not made for cars. It's very difficult to park all over the old-town.
But, there are Free Parking Spaces, around town and in my street as well, but they are not that many.
Althouhg, there are some secrets that locals know, some 2 minutes walking from your accommodation ;)
PARKING NUMBER 1 - Church of Santa Maria
Just 2 minutes walking from Sintra WOW, there's a Church from along the hiking trail between the Moor's Castle, Pena Palace and the Historic Centre of Sintra, founded by King Afonso Henriques in the 12th century.
On the right side of the Church there's a free parking place for about 20-30 cars (only locals know about it and park there at night)
You can defnitly park your car during all your stay.
Just put on Google Maps this: Calçada dos Clérigos 61, Sintra
Or click here: https://maps.app.goo.gl/Zzv36w7MfH7TYxFYA
Just keep in mind that from that Church Parking Spot to the Sintra WOW door, you will have to walk just 2 minutes, BUT, it's a very long, narrow, and inclinated historical stairs (not the best to bring luggage or bags) - Just to advice you about that!
Maybe you can drop your bags first by car at the door of Sintra WOW, and then go around again to park in the Church free parking spots.
PARKING NUMBER 2 - Largo São Pedro Penaferim
The second, closest PARKING LOT from Sintra WOW is also free, here are the details below:
Name: Estacionamento Largo São Pedro Penaferrim
Address on Maps: Praça Dom Fernando II 11, 2710-492 Sintra
Link already set-up from the Parking to Sintra WOW:
https://maps.app.goo.gl/DCk6L1Mp5Qrosz339
Duration Walking from Parking to Sintra WOW: 12 Minutes
But my suggestion to explore Sintra, is indeed to find a parking spot, leave it there and move yourself by walking (we are super well located), or Tuk Tuk (very cheap), or Uber (there's lotssss of them and they arrive in 3-5 minutes when you order at any time of the day)