We agreed to switch to this apartment from the first floor in the building but were still very happy. The apartment was very clean, extremely convenient to La Condesa cafes, restaurants, Roma Norte, Hipódromo, etc. and an easy Uber to more of the big sightseeing locations (El Centro, National Museum of Anthropology...) and the balcony is great to relax, have a drink, quick bite. Only thing is there is little airflow the days we were there, even with windows open and we couldn't find a fan (there was a space heater, though). I believe they purchased one now. There is an upper level with narrow, spiral stairs which has a ceiling fan but my wife is pregnant and that was a tight fit. Maybe you can sleep up there.
Overall: the location is awesome, clean apartment, hot water, easy communication with Iza and Clau, solid Wifi, balcony for two, walk up to the 4th floor, sizable = a great stay and comfortable way to soak up the amazing CDMX! I'd book again.