We had a wonderful 5-night stay. Helena was quick to respond to communications. Her husband Alvaro met us at the apartment and was very pleasant and helpful. The apartment itself is perfectly situated, very near the Tribunal metro station (just a few blocks) but also an easy walk to Puerta del Sol and Plaza Mayor. As others have noted, it can be noisy in the street below because of the fish market/restaurant, but that is to be expected in the center of Madrid. The apartment was clean and nicely furnished, and the kitchen was well-equipped. One thing to be aware of is that the bedroom with the two twin beds does not have a window and can be hot and stuffy. After one night, we rearranged and moved out to the futon in the living room, and we all slept much better. Overall, for the location and the price, you can't beat this apartment or the hosts! We would not hesitate to return.