Sergio indeed is a lovely host and the staff are not only friendly, but very helpful. The apartment was perfectly clean, modern and comfortable, other than the noise noted below.
Now the bad. It is described as: "Located in the heart of the city in Polanco area," which is misleading. In reading this, we assumed it was right in the heart of the Polanco area, but the apartment is not even a comfortable walking distance. It was a short uber ride, but that is not what we expected. Other than a grocery store, there was very little around the apartment. You must uber everywhere.
Worse than the location was the noise. It is located right on a very busy street, nearly a freeway. While the bedrooms are located in the back, the kitchen and living areas are not. Even closed, the windows do not block the noise in any way, day and night. Noisy neighbors in the building next door were also bad.
This is definitely the worst feature of lovely place and for that reason, we would not stay again.