You've chosen a great time of the year to visit the Distrito Federal, the weather is perfect, cool in the morning, hot after noon and back to cool for early evening. In fact bring a light sweater if you expect to be out after 7 or 8 PM when it does turn chilly. As to the cab ride from the airport, you have to purchase a ticket for cabs inside the terminal and a ride from there to Condesa (my nabe --more commonly referred to as Condechi ) might cost between $150 Pesos (1bag and a 4 door sedan) to $300 P for 2 to 4 bags and a van. DO NOT pay for anything bigger than a 4 door if you don't need it. The ride can vary depending on the arrival hour, anything between 7 AM and 9PM can be a horror and last an hour or more. The cab ride between 10 PM and 6AM is usually about 15 to 20 minutes! Its a BIG city and traffic jams anywhere are not uncommon. But if you are actually staying in Condesa think of the West Village deserted with 2 beautiful parks and incomparable dining ever other step. My own recommendations for this area are (1) Ticoncito for tacos al pastor (2) El Bajio,just opened after 35 years a second spot, in Parque Delta on Ave. Cuahetemoc (3) El Raco on Ave. Sonora (across from Parque Mexico), catalan style, for their salt baked huachinango (4) La Botica, Campeche 396, for Mezcal tastings (5) Frutos Prohibidos, Amsterdam 244 for help with the hang over in the form of great fresh juice combinations and finally (6) for a great view and relaxed snacking the roof top terrace of the Condesa DF hotel on Ave. Veracruz a stones throw from Praque Espana. There is so MUCH more in the rest of the city aka. Jardin del Pulpo in Coyacan on the corner of the public market, Fonda San Angel on the Plaza Jacinto ( Saturday artesanias market), El Tajin also in Coyacan for breakfast and lunch ( owner Alicia D'Angeli was foremost in the proposal to UNESCO to designate Mexican cuisine Patrimonio Oral y Intangible). I'd better end now but if you want more -- just let me know!