Flavia and Carlos' apartment is stylish, clean and very modern. The Mexican coffee in the fridge was lovely. The whole apartment block is really great, comfortable and safe.
The only issue we had, and this might just be representative of Mexico City in general, but the noise from the street was pretty unbearable. You could hear absolutely everything from hustle bustle, music being played from shops at all hours to the bus driving past. We were woken up quite a few times from people shouting.
If you're a light sleeper this probably isn't the apartment for you. However, if you're a heavy sleeper this place is really lovely and a great apartment to escape to after a day of exploring.