We had a great time! Diana's apartment is the perfect place if you are looking for a safe and local accommodation. Diana and her partner were super nice and helped us wherever they could. The room is just as described, big kitchen with everything you will need. The wifi is very good, we were there for work and everything was just perfect.
We also totally fell in love with the area, San Miguel Chapultepec: it's totally safe, very close to Condesa and Roma (we always walked there) and there are cute little Cafés and breakfast restaurants just around the corner. 100% recommendation!