My overall experience at Karla's place was very good. The apartment is well located: safe, neighborhood feeling, parks close by and walking distance from good restaurants. It's close from Hotel Condesa which is good if you feel like having a great breakfast or have to schedule meetings. As I was in the city for business it was great.
My only comment is that in "cold" days (10-12 C) the apartment could get cold. Nevertheless, the double bed has really warm covers.
Would stay here again.