Beware that there is a restaurant downstairs which is playing music until 10pm. Also, when we were there there was a problem with their smoke alarm so that it constantly beeped (even throughout the night).
Pedro is nice but did not mention in the listing we had to pay sintra tax (2 euros / person) and that we had to give our passport info (airbnb policy requires the host to mention this in their listing).
By far the most appalling part of our stay was that while the place looked sparkling clean at first, we opened a drawer with pots, pans, and other kitchenware and found that there was mold everywhere.
One final note when travelling to Sintra is that while it is a beautiful town, you definitely pay tourist prices for restaurant food.