We spent two months in Carla's apartment. The flat might not be the most modern, but it's super cozy, spacious, very well equipped and in an excellent location!
We were both working from home and the internet served us very well.
Carla and Marc are excellent hosts, whenever we had the slightest problem they were always quick to react and resolve.
The Napoles area of Mexico city is bit outside of the center so it's bit more relaxed but still plenty of options for eating out or to go shopping. It's also very green and very very safe.
The only problem we had during our stay was the noise level of the neighbour girls who had newly moved in next door, but Carla handled them like a pro and by the time we were leaving, they were much more quiet and respectful.
Altogether we really enjoed our stay, we will truly miss things like watching humingbirds or squirrels from the balcony or playing Mario Cart on a Nintendo64 on rainy evenings. :)
It's a nice place hosted by very nice people.