Not to overdo it, but if you have not been to Koony's, then you have not tried a real pizza in…read moreMexico.
There are other "good" pizza places in Mexico, however for me, Koony's beats them on all levels, atmosphere, food quality, service, etc.
They are not cheap, however you get what you pay for.
It is always a delight to run into the owners of the place (who understand customer service), and the staff is the best I have seen anywhere in Mexico (still the same staff as the first time I went).
My favorites are the Tuna Special, and the Mexican Pizza, also their desert pizza (with a great cup of coffee) is a must try. Did I forget their special pasta salad? To be honest, they have too much great items on their menu to taste in one visit.
Whenever I have the opportunity I will visit the again when I am in DF.