Andreia's little flat is perfect for a stay in Sintra. Its away from the centre of the old town (which gets very, very busy) but easily walkable for eating out and having a wander around. We really enjoyed being out of the chaos in the evenings.
If you're feeling tough its a manageable walk (uphill) to the Moorish Castle and the Palacio de Pena from the flat too.

The flat was perfect for us and had everything we needed to cook dinner and relax in the evening. It was lovely and quiet as well. We had a great time.