We stayed for two nights in Michelle's apartment, but we wouldn't have minded to stay there during our entire trip in Spain, what an amazing place! The photos on Airbnb don't do the place justice; the apartment is extremely spacious, beautiful and on the third day we were still amazed by how quiet it is at night, especially when you consider it's next to Gran Vía and one of the main pedestrian streets of Madrid. We had no trouble going to all the places we wanted to see, as most attractions are at walking distance, and the metro is just one minute walking from the apartment.
Michelle was very friendly and made sure we had an great and comfortable stay.