I was staying at Felicia's apartment for 1 months and I'm totally happy with it.
1. Check-in was fast and easy. Felicia met me in the apartment even though my flight was delayed. Communication during my stay was very nice, Felicia was helping fast with all the questions.
2. The location is very good - supermarket is 5 min walk, there are a lot of restaurants and cafes around, it's close to other nice neighborhoods. The street is quite calm expect the weekend when you can hear the music from the bars, but for me it was ok.
3. The apartment is very nice and cozy, looks the same as on the photos. The kitchen is very well equipped. There are no problems with the cold and hot water (usually apartments in Mexico city have such issues).
4. WiFi works ok. Sometimes the speed was not enough for the video calls, but mostly it was working good. There are few co-workings in 5-10 min walk for those who need a high speed.
5. Felicia has a very good cleaning lady, so you don't need to worry about cleaning. The cleaning is paid separately for those who have a long stay, however the price of cleaning is average.
I'm definitely going to come back to this apartment for my next visits of Mexico city :)