We had an excellent stay in the apartment. We did not see Carlos, but Victor was there to show us around. The apartment has everything you need for a nice stay (although the warm water may run out quickly if you are with a large group). The apartment is right in the center next to the Opera and the Royal Palace, and in walking distance (20 to 30 minutes) to the big museums. For those who do not like to walk, there is also a Metro stop next door. I would surely recommend this apartment to others.