Mexico City Letter for citizenship

I have been driven around DF many times and hate it. Would appreciate hearing from those who went if they flew or took a car. Location to bet this clearance security letter. Time involved. Secret tricks.
Thanks

Fly in verr early get a cab to the place in Coyoacan to be there when they open , one hour later you will be out get a cab back to the airport to fly out mid afernoon.. We wen 3 times Other times we flew in in the AM spent the day in the center went there in the morning and flew back late afternoon..
No need to get a car it would cost you more than a cab.
Check their site they tell you what to bring. No trick no secret.

I took the overnight bus on Primera Plus. Arrived 7AM in Mexico City, took a cab for about $100 pesos. Got in line, done by 9:20AM. Breakfast and coffee at nearby cafe. Cab back to bus station. Back to Guad by 7PM. Flying sounds even better!