We were 2 families staying in 2 flats next to each other. The flats were so clean and ready for us when we arrived. Coming from the airport was also really easy by using the metro and when you arrive to Plaza Callao the building is just in front of you.
Very very nice apartment, at the center of the city and just as it is seen in the photos. It is really so easy to walk around.
Alicia is very friendly and helpful too. I would highly recommend this flat.