Hermann is an excelent host!
He received me and told me all details of the appartment ( television etc.)
He also provided on writing general usefull information about interesting turistic atractions in the City and other general to do and not to do things.
The appartment is very central, only 3 blocks away from Reforma and the "la zona rosa".
There are a lot of different restaurants in the neighbourhood, also supermarkets and bancs.
The area is also very safe. I was there for work and will definitely come back during my next trip