We did not meet Carlos, but his son was really helpful and friendly. He stored our luggage before and after check in/out, so we were able to explore the city without any hassle.
The apartment is small, though a big plus that it did not get that hot inside and that it had air conditioning. Besides, we were mainly there to just sleep.
The only downside, at the time, was that there was major construction/renovation going on, on the floor above. During the day it was fine as we spent most time outside, but it meant you would wake up at 08.00 by the noise.