Make sure you check the airline and terminal, since this hotel is in T1 and getting from T1 to T2 is one of those no bueno type of situations. If you're flying out of T2, the NH is a likely to be a much more painless situation. I've never stayed at this particular Hilton for that reason. It's also usually pretty expensive relative to hotels in the city.

That said, I've had some early AM flights out of MEX and one of the only benefits is that there is no traffic at that time of day, so you can easily get from Polanco, Roma Norte, etc. to the airport in a flash.