The apartment is as described and shown in the photos for the interior (a quaint attractive studio). The apartment is directly on the street, so best to keep the curtains closed for privacy. However we were not disturbed by any street noise at all.
Communication was very easy with Maria, she was quick to answer all our questions, checkin was via keypad, and a few start-up basics (coffee, tea, water) were provided.
The outside sitting area is not actually attached to the apartment, one has to go out of the apartment (onto the street) and then in from there. So not really convenient to go and sit and have an early morning cup of tea or late afternoon glass of wine. This was the only (minor) drawback to the apartment.
It is very conveniently located in Sintra to walk to many places, there is a public car park right at the end of the street (a little expensive, but easier than driving around looking for parking!).
We would stay there again!