The apartment is in a charming old building in a spectacular location (super close to the Prado, Thyssen Bornemisza, Reina Sofia, Buen Retiro, and train station). Everything was very clean and, although it was a bit small, it is perfectly sized for a couple. Helena was responsive and very kind. One slight downside was that, because the apartment is a flat within a flat, it was a bit noisy at night when others would enter the main entryway. Overall, we had a lovely stay. The place is great if visiting the art museums is your main objective.