My boyfriend and I loved Diana's place in Portales Sur! Diana was very accommodating and helpful as we had booked our stay during the water shut off in CDMX. We ended up having to book another place for the last half of our trip due to this, however, Diana was very gracious in helping us!
The space is just as described, with a beautiful kitchen and private rooftop area which we very much enjoyed. The neighborhood itself was great, with a lot of authentic restaurants within walking distance (there's a pozoleria right across the street!). It was very lively on the weekend nights we stayed (we enjoyed the sounds, but there was lots of activity well into the early morning). It is very close to the Coyoacan neighborhood (about a 7 min Uber, give or take), where Frida Kahlo's house is located, as well as the Coyoacan Mercado (it's amazing!), and lots of other restaurants, bars, coffee shops, and markets. We loved the proximity! Ubers into the center of the city were usually around 30 minutes, but always easily accessible.
Diana will let you know, but keep in mind that the apartment is on the fifth floor of the building, with no elevator. This can be difficult for the initial check-in with luggage and such.
Lastly, the building is secured with guards 24 hours, which is always nice and they are all very sweet :)