We had a few minor issues during our stay: the apartment is not so suitable for big guys, my husband is 1,93m and he couldn't really stretch himself. When he lays in the bed, he almost touches the wall on the other end. Aside from that, the apartment is a little bit dark (lights need to be on all the time) and the window in the bathroom seems to be locked. The ventilation was not so well.
Other than the above, the stay at Sergio's place was overall a lovely one. The location was perfect, with a small grocery right in front of the door across the alley, a few restaurants quite near, and many sightseeing spots / shopping area within walking distance. Public transportation is also easily accessible. The apartment is small but super equipped, even has a full kitchen. Sergio himself was very responsible, he also kindly allowed us to check out late. The taxi service offered from the Sergio was considerate and convenient, punctual as well.