Great stay, excelente anfitriona - Marta was a great host. She is very knowledgeable about the area. As an art/humanities person we had several great conversations about her work. Don't let her dog dissuade you from staying, he is so relaxed and will not bother you.
We were looking for a home stay experience instead of a city center hotel vacation and Marta' s place was perfect. We strolled the local market many times, visited the abarrotes shop every day and tried to get the feel of the community.
The metro is close enough for trips into the zócalo and we walked to chapultepec and monumento de la revolución. Xochimilco was a long trip by metro and train but posible on public transport.
Overall, a great experience.