Magdalena is one of the best hosts I came across on airbnb. In addition to being very responsive, the flat was equipped far beyond expectations (including the bathrooms and the kitchen). I would say that it is ready for a family to move in and you will only need to bring your own clothes. In the flat you will have plenty of Madrid and Spain travel guides and other materials including Magdalena's own recommendations, which were pretty good in our experience (especially restaurant Triciclo, which you should not miss!).
The flat is very stylish, spacious and has a good location. Amenities are nearby. The equipment in the flat was in good condition. Will certainly come back when in Madrid.