We got terribly lost on the way to the apartment, but that was 100% our fault. Izumi was very responsive to our frantic texts to give directions, and when we finally made it, her mother let us in and was very sweet. It was very clean and the kitchen was well-stocked (thanks for the piri-piri sauce--I was very curious what it might taste like!) and the location is perfect. We hiked to Pena Palace and Moorish Castle and it was amazing. The view of Moorish Castle from our patio made it look very far away, but it was very doable even for a non-hiker like me.
Also, some people have mentioned the train noise, but I barely noticed it. When I did, I found it very soothing. There's definitely not horns or anything--just a gentle rumble from time to time.
Thanks Izumi!