I stayed here a couple of nights before a friend's wedding.
First of all, the location is good in the quiet Condesa district with lots of great restaurants within 10-15 minutes walk.
I had a huge room (Carlotta) which was very lovely - but you can hear noise from the street (get a different room if you are sensitive to that).
The staff is super friendly - good English skills at the reception, no problems there. They helped arrange a guides tour to see the pyramids (the tour was a bit long so check to be sure) and gave advise on using the metro.
Finally, the breakfast must be mentioned: a new daily special every day - all of them delicious. Breakfast is served at one big table where you get to smalltalk with the other people staying at the Casa Comtesse. More