I second what Sparks and Rodrigo said. First we have to know where you (or your spouse, if applicable) are going to be working. Otherwise you could be spending as much time commuting as working, and I mean that literally. In the worst case, it can take 3–4 hours to cross the city. One way.

Polanco is not necessarily among the safest areas, as it is a very upscale neighbourhood, and there is a lot of money there. It is also very expensive in terms of rent.

There are good and not-so-good neighbourhoods throughout the city, and the best strategy would be to first narrow it down to a region of the city on the basis of work (and/or your daughter’s school) and then ask about suggestions for that region.