We had a fantastic stay at Sonia's apartment in Sintra. The apartment was as described- with a cottage core vibe and a very comfortable, relaxed feel. With our family of teens, having the separate rooms was great. The views are AMAZING!
Yes: there are a lot of stairs to climb but this is par for the course in this town (I got a "rollercoaster badge" on my Fitbit the day we went to the Castle of the Moors and Pena Palace!).
I also greatly appreciate Sonia's patience and solid communication when we first arrived. With no sleep on our red eye flight, I was exhausted and disoriented. She was extremely responsive and let us know as soon as the place was ready for us.