I spent a month in Gabriela's apartment and had a mix of experiences both good and bad. Gabriela is perhaps the best host I've ever had. She was extremely helpful and responsive whenever there were problems...and unfortunately there were several. I got stuck in one of the elevators one night and had to wait for about 15 minutes for it to work again. And, another night I came home to a flooded living room. We later found out there was a leak in the pipes in another apartment affecting this one. So, there are some building issues.
The apartment, however, is wonderful and just like the photos. And the views really are astounding. I loved having two full walls of windows above the city. However, with all the windows and sunlight comes a lot of heat in the afternoon. But, worth it. The location is wonderful--Roma Norte is a great area for restaurants and walking around and near the metro. And the front desk people are very nice and helpful.
So, the only real problems were with the building. Hopefully these will be fixed soon, as otherwise it is a perfect place to stay in Mexico City with one of the best hosts you could ask for.