I had an amazing three-week stay in Mexico City; my eldest son stayed with me the whole time, and my youngest, on weekends. Guisela furnished a cot to accommodate us all, but we could have rented an additional bedroom at a modest extra cost. The apartment is clean, spacious, comfortably furnished, with amenities like a desktop stereo and smart TVs (using our own Netflix password), a well-equipped kitchen, and an impressive library featuring Mexican and Latin American authors. I worked remotely and the Internet functioned perfectly.
The neighborhood, Del Valle, is vibrant and active, with delicious restaurants (seafood, Argentinean steaks, Doneraki "tacos árabes"--my favorite), groceries, and cafés all within walking distance. It's a centrally located, upper middle class neighborhood, though not overrun by foreigners (like Condesa). The best thing, though, is the hostess herself. Guisela is very responsive, communicative, helpful, and kind. I would stay there again in a heartbeat.