This airbnb is a heaven ! I stayed for 3 days with my family and my friends and everything was beyond perfect ! As you can say the house is in a calm area so you may be need a car for more flexibility but you can also take a Uber, or the bus. You also have a supermarket near the house just in case. In our case we took a car ^^ . Sofia took care of us so much ! few days before our stay she sent me an email with all the details and useful information about the area, facilities and good advice for our trip. I'll definitely go back in this house if I want to take another trip in Sintra !