Rocio was not there but helped us with a collaborator and was always available by phone. Her instructions were clear and comprehensible and we had no problems during our stay, for the check in/out (very flexible times) and in general with the apartment. The apartment is in the most central part of Madrid just ten/fifteen minutes walk to Prado, parque del retiro, Palacio Real and other museums, parks and palaces. Very big and in a silent position, facing the internal courtyard of the building, it is well equipped and adequate for six people to live in. We also found it perfectly cleaned at our arrival and equipped with blankets and clean towels, plus pefectly functioning air consitioning. The disadvantages were we had to buy all of the basic goods except for washing powder and that neighbours easily complain, though it's quite comprehensible being a residential area.
P.s. Attend to instructions and lock the entrance door of the building after 8 p.m. to avoid homeless people from entering

In conclusion, the place is absolutely recommended for a stay in Madrid and I will probably come back