Guli is an extremely welcoming and friendly host. I stayed for two weeks, so we essentially became roommates, and I had zero problems with this arrangement. The apartment is in a central location with direct access to Reforma and Chapultepec. It is near the highway, so that must be taken into consideration. I was not bothered by the noise, but I did use ear plugs on a few occasions. The building is easy to access. I mostly walked to cafes, taco stands and restaurants nearby, and enjoyed a few 20 minute walks to Roma and Condesa.
If you prefer to stay with a local who is considerate and has tons of recommendations then this is your place.