argentina has many pesos-to-dollars exchange rates (for reasons which really do not pertain this communique) three of which are of interest to you, the foreign reader. the official one, about 950:1 (pesos:dollars): this is what you will get if you go to the bank to exchange paper notes, and what you're very likely to get if you pay with your us-based amex or mastercard. do not do this. the blue rate, which traders ~15% higher —about 1100:1. this is what you'll get on the (let's call it) gray market. if you like paying for things with cash, let facu or marissa know how much you'll want, and they'll be happy to hook you up. finally, the "mep rate", which is basically a special rate for foreigners. it typically trades a few basis points above the blue rate and the easiest way for you to enjoy this is to just pay for things with your visa card. this is the recommended way. unless you're planning on really straying off the beaten path, almost everything you may want to do is payable with plastic.
Uber works great, and if you already have an account set up in the US, it works exactly the same way.
While violent crime is relatively uncommon, especially against tourists, incidents of petty theft do occur, so keep your belongings close to your body.
The weather is expected to be in the mid 70s-mid 80s, with lows in the 60s. You may want to bring a light sweater or sweatshirt for the evenings. Humidity is relatively mild at this time of year.
Food: empanadas, bbq (asado), provoleta, gelato, alfajors, dulce de leche Drink: Malbec (most famous) and Cabernet Franc (lesser known but also excellent) red wine varietals, Torrontes and Chardonney white wine varietals, Fernet liqueur (usually served with coke)