Sergio was a super nice and accommodating host for my dad and I in Madrid. I needed to get a pair of jeans fixed and he suggested an excellent tailor down the street for me, which saved me the hassle of looking myself. As for the apartment itself, it really is in an excellent central location--a short walk to Reina Sofia, Atocha Station, and the Plaza del Sol. The only hiccup we had was an issue with the shower: apparently the woman downstairs said water was leaking into the apartment! To Sergio's credit, he contacted her and the day we left he was having a plumber come in to fix the problem.