Nice big apartment which accommodated all 7 of us. Having 3 bathrooms was a bonus, especially in the morning and nighttime. The kitchen was well organised and clean .. we successfully cooked several meals there, mostly breakfast, and the apartment did not feel cold even when we stayed during the winter.
Very close to Atocha station .. if you pick the right exit from the station you are literally just a couple minutes walk away on the street and don't need to cross any roads. Hence, it's a great place if you're taking the train to Barcelona (which we did) or coming from the airport (direct train line on the Cercanias) Also, great place to stay if you want visit the Big Three museums which are close to the apartment. In fact, most tourist places are walkable from the apartment. We walked around the city a lot and hardly needed to take the metro.
All in all, highly recommended for large groups (6-7 pax) who would like to take over an entire apartment and value the convenient location.