As is recommended throughout the city, Uber is an extremely affordable and convenient option from the airport (a ride into Roma/Condesa will be about $7-$10 USD).
Uber is HIGHLY recommended in Mexico City. Typically, an Uber ride around town runs about $1.50 - $3. If you prefer to grab a taxi, you could easily get one from your hotel
La Condesa and Roma are walkable with beautiful parks, tons of restaurants/coffee shops, and great bars. Polanco is the most cosmopolitan/high end neighborhood in the city and another great choice.
In a restaurant, 10-15% is expected. For taxis/Uber, is it not expected unless the driver helps with your luggage (10-20 pesos is fine).
Cocktail Attire / Semi-Formal / Dressy Casual: Guys : Suit and tie Ladies : Dress / Jumpsuit / Other cocktail attire