We loved our stay at Giulia's apartment so much that we have already booked our 2nd stay for our return to Madrid! Her apartment is perfectly located, just steps off of Calle de Serrano, and yet it was quiet, peaceful and secure/safe. Every day we walked everywhere, to Market (around the corner) coffee shops, restaurants, shopping and sites of interest. I am extremely particular about cleanliness and comfort. Giulia's apartment is spotless, with cozy furnishings and very comfortable beds. The unexpected bonus? TWO separate showers in the bathroom allowing privacy for two to shower simultaneously with no loss of water pressure or hot water. The apartment is on the 4th floor so you can choose the lift or to walk. Others mentioned the "trickiness" of unlocking doors with the keys. I would agree that it is technique not force (no pulling or pushing). All 3 of us found this to be of no concern and we had no difficulty locking or unlocking of any of the doors (building or apartment). Thank you Giulia! We are excited for our return visit!