Javier's place is in the BEST location for visiting the museums and walking around the city center. The area it is in, Huertas, is pretty quiet and there are thick wooden shutters on the bedroom windows facing the street so if there is noise in the street on weekends, you can close them and it's quiet for sleeping. The area is old cobblestone, narrow streets, and super picturesque. We ate all our meals within a ten minute walk with tons of variety of restaurants. The place at the end of the street toward El Prado has breakfast starting early and fantastic coffee con leche.
Javier met us at the apartment and called us a cab upon our return to the airport. We stayed for twelve nights and enjoyed it all. He has maps and some guide books available in the apartment. We needed to contact him one night about midnight for a small issue and he came over immediately on his motorcycle and flipped a switch we didn't know about.
Great experience for our party of four. It's a huge place and could have held a lot more but we wanted to be able to spread out.
Watch out for the birds if you hang your clothes to dry on the balcony! They seem to like to knock things off the line! Hilarious.