We found Guillermo's place in a good location. Soriano supermarket is just around the corner. Chapultepec Park is close by as well as coffee shops and places to eat. The local Ecobici (bikes) are within walking distance and are very economical. The metro #1 wasn't working when we were there but there are also buses close by.
Guillermo's place was very clean and he had everything you needed in the kitchen. it is a quiet space.
Guillermo was a wealth of information.
We would recommend this place!