We had an amazing stay at Alfredo's apartment. Pictures do not do it justice, it is more spacious and better lit than it appears in the listing.
Having spent lots of time exploring the Centro during previous trips, I was worried we'd feel uncomfortable walking the blocks surrounding the apartment after dark, but in the end we came and went as we pleased and felt at home.
There was an issue with the water pump during our stay, and while it was in no way Alfredo's fault, we were somewhat dissapointed with his responsiveness to the situation.
Overall, if you're looking for a little hideaway tucked inside the fascinating chaos of the Centro Histórico, this place is a treasure and a steal.