My friend and I spent a few days at Carlos‘ and Madalena‘s place. We loved the quiet place (away from the tourists) and the (cold) pool. It is located very well, you can reach Sintra, the beach and Lisbon in about 10-20 minutes (Airport Lisbon 30 minutes). We were happy that we rent a little car because of the narrow and steep streets.
Communication with Carlos and Madalena was wonderful. We only met them at our last evening at Sintra, but we felt very welcome nevertheless.