Sergio's place was fantastic for our recent trip to CDMX. The location is terrific with it being close to the Chapultepec Park and a bunch of good restaurants in the La Condesa area. Sergio and Martha were also very responsive and made check in very easy.
As other reviews have mentioned, it is close to a major highway however we did not find the road noise to be very loud at all and had no trouble sleeping at night. One other thing to mention is that the place is almost entirely windows which is fantastic for the views but midday can make the place very hot. We didn't spend much time at the Airbnb during the day as we were out exploring the city but this is just something to note if you plan to spend a large amount to time at the Airbnb during the middle of day.
Overall, fantastic place with amazing views, great hosts, and convenient location!