Good location, very close to Bazar del Sabado and other nice spots in San Angel neighborhood. Great Mexican style breakfast.
Martha was very responsive the whole time, before and during our stay as well as afterwards - I had left a couple of earrings in the place and she did everything to find them.

One warning though: the place is NOT a studio but a room inside a house, and walls are quite thin - so you don't get a lot of privacy. At the time of our stay, there was a large group of guests who were very loud: we were waken up in the morning both days as we could hear everything through the walls.

Nice place and good value for money, but if you are looking for privacy and relax I wouldn't recommend it.