Stephanie's apartment is a great choice for single travelers looking to stay in a clean and safe apartment while exploring CDMX. Her building is on the same block as a hospital (Star Medica) and thus always has working professionals outside rather than the more common club experience of Roma. That being said, it's one block away from great bars, cafes, etc. and a short walk to numerous parks.
Her unit is one floor above the street (~20 steps) and is a large 3 bedroom apartment. As a guest I was encouraged to use the kitchen, dining area, one of the bedrooms, and the closest bathroom. There was plenty of hot water and I did not find the apartment to be loud but the street noise may bother guests who are coming from rural areas. The wifi is very fast (>100 mbps down) and the power is reliable.
The bedroom is ideal for one person as it has a single bed and not a lot of furniture (no desk or drawers inside the bedroom). It is a pretty large bedroom and there is no electric heating or air conditioning, but I did not need either during my stay in December. I'd definitely stay at Stephanie's apartment in the future.