I really liked Jimena's place. Excellent value for money, very good location close to a subway station and a very good supermarket and some good restaurants.
I did not have the chance to meet Jimena but she made herself present always asking whether we needed anything.
Right across the street there is this little Cafe/restaurant that serves a very good breakfast and lunch - Paula, the owner, does her best to make you feel at home -, and she can speak English, in case you don't speak much Spanish.
I totally recommend Jimena's place and apart from that, Mexico City is fantastic!!!