We enjoyed a full week in this apartment over Christmas. It's in a quiet section of Roma, away from traffic and late-night noise but still perfect for walking to restaurants, parks, and nearby neighborhoods. It also has great metro access for getting around to the whole city. The apartment is spacious and it has a fun style decorated with Olivia's own paintings. She stayed in touch with us throughout the trip and answered any questions promptly.
As other reviewers have noted, the furnishings are spare and worn but overall the apartment is a good value. There are quirky maintenance issues typical for travel in Mexico, but everything is functional and as advertised. For more than 2 people or for extended stays, cooking regular meals in the tight kitchen and the lack of hot water in one bathroom will both become nuisances. Neither is a problem for short stays.
Be aware that the apartment is up on the 4th floor and without heat -- not problems for many travelers but potential deal-breakers for some. We came during a week of especially cold nights and Olivia quickly arranged for a neighbor to loan an electric space heater.