My cousin and I stayed at Romulo's place during our visit to Madrid. Romulo was very communicative with me after I booked my stay at his place - he immediately provided with me with information about how to get to the apartment, as well as what to do and where to eat during my stay. We were greeted by his colleague Rosana, who showed us around the apartment. The apartment is very centrally located and you can easily get to all the tourist attractions on foot. It is essentially down the street from Plaza Mayor and the palace, and all the other main areas are also within a short/reasonable walking distance. I'd definitely recommend a stay at this awesome apartment during your trip to Madrid!