The apartment is quite central, it is small but sufficient for two people (we were a party of 3 but due to a delayed flight only 2 people used the apartment). In a few minutes you get to Plaza de Armas, so it's well located. There is a Starbucks one block away and a coffeeshop just opposite the apartment. The location above main streets makes it quite noisy with traffic, but one can sleep comfortably with earplugs.
It is a bit cold in winter as the heaters provided are not enough (one room is ok, the living room where the sofa bed is remains colder).
We asked information about transport from the airport but did not receive many details; we also asked for recommendations for places to eat nearby (as we arrived late at night), but we were not given any specific recommendations, only a mention that there are plenty of places around; however late in the evening it is difficult for a foreigner to know which ones would be open. Some more indications would have been useful. Natalia was kind enough to let us check out late on the day of departure. All in all the stay was sufficient for our needs.