i spend 40 days in Flor's place and it was one the most awesome experience in my life. Flor is nice, very easy to talk to, and she has a lot of good advices for you from places to visit to places to eat. she's speak a little english and can ask her everything.
the apartement is very clean, and very well situated. you got the historic center at 1 mile and you have the bus and metro at less than a mile
i highly recommend Flor's place for your stay in Mexico City