My girlfriend and I stayed at Luisa's apartment for a month, during which we were very happy. Luisa and the apartment manager were extremely helpful throughout all of our stay. There were a few minor issues with the water boiler and internet, while we were there, but they were quickly addressed. A plumber was brought in to check on the water boiler and replace a battery on the same day we notified it (it worked perfectly thereafter) and they upgraded the internet plan during our stay to provide a faster connection.
The building felt very safe, with 24hr security at the entrance.
The location of the apartment is good, one block away from reforma in Colonia Renacimiento.
The bedrooms, bathrooms and kitchen are equipped with the basics and perfect for short or mid term stay.
The only minor issue that remained in the apartment after we left is that the laundry lacks a ventilation duct and the moisture from the dryer condenses and humidifies the hallway if the windows aren't open.
Overall the place is great. I would stay there again.