We stayed here because we were a family with a mission: to feast on Madrid's museums. There were 7 of us, age 8 to 76, two couples, two older children, and one youngster, and the apartment was not only comfortable for us, we could have squeezed in one more without any problem at all. The facilities are more than adequate. We all felt that this is an extraordinary bargain.
Even though the apartment is just a few minutes walk from the main railway station, it is perfectly quiet. Our host, David, was a pleasure and gave us great advice about the life of that neighborhood--much, much nicer than you might think, given the nearness of Atocha station. It is a VERY easy walk to the Prado, Reina Sofia, and the Thyssen museums, and the Retiro park, and with a little more effort, the Centro district.