My girlfriend and I stayed in Susana's place for 3,5 months while we studied in Madrid. The place is truly wonderful, and the location is perfect. Basically, everything in Madrid is within walking distance, and still, you don't really hear the noise of the city. Because the apartment is on the top floor, you get a lot of natural light in all rooms through a regular window or a skylight. You will have a washing machine and a fully equipped kitchen, the only thing missing is a dishwasher. However, as long as it is warm enough, the absolute highlight of this apartment is the rooftop.
Susana is the sweetest host I have ever stayed with. She is super helpful and responsive and even offered to buy an extra wardrobe. Whenever I come back to Madrid, I want to stay at this apartment again.