I had a lovely welcome from Ángela, who showed me around the apartment and also recommended a few places to visit during my long weekend.
The apartment is in a fantastic location, within an old historic building. It was easy to get to from the AirPort Express bus and the Metro stop. There are quite a few stairs to get to the flat, but they're manageable and you get a sense of achievement for doing them!
The lounge and bedrooms were comfortable and I slept very well with the memory foam pillows. Kitchen was clean and had tea/coffee pods, dishwasher etc.
One of the main reasons why I booked this was for the private terrace. It has a beautiful view of the Iglesia de San Juan Bautista. Even during January, it's a great place to get a bit of sun, sit with a coffee (and a book) and watch the world go by. You can get a real buzz of the city as well during the evening.
Really recommended, either as a solo trip (like mine) or for a romantic trip away really.