The apartment is very well located, walking distance to all the 'must-sees' of madrid and public transport. Jose Pablo was very easy to reach via email or mobile. I never personally met him but the people working with him are very personable and accommodating. The building itself is just around the corner from Plaza Mayor and all the good places to eat and shop. A couple of drawbacks of the apartment and the building include a really tiny lift and the lack of ventilation in some of the rooms.
Otherwise a great place to stay