The apartment is lovely and very well located. The area is calm and easy to access the main attractions (there's a bus stop very close that takes you to the center, the Pena Palace and the Mourish Castle - line 434). If you're coming by car, there's free parking very close to the house.
Maria and Joaquim are lovely hosts and will give you great tips for you to really enjoy Sintra.
We loved our stay and will certainly come back.