My friend and I had a great time in Madrid and enjoyed Clara's apartment. It's in a great location and walking distance to a few trains which was helpful for us.
The only thing we would have liked to change was the radiator/heat system as it did not seem to come on until much later in the night or early morning. This left the apartment chilly in the evenings.
Clara gave us great restaurant recommendations and even helped with contacting places for reservations when we had a difficult time finding information online. The apartment comes with everything you'd need, especially if you plan to cook some meals during your stay.