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It can be expensive, but look for self-contained accommodation and eat at local places outside the resorts a lot, that will save you a ton on food costs.
Don't stress, for a US passport the Electronic Travel Authority (ETA) is super quick, usually approved in minutes and just linked to your passport, it's mostly hassle-free.
For a first-timer, Uber might feel easier, but the Metro is very efficient and clean. The downside is that it gets extremely crowded during morning and evening commutes, especially Line 1, so prepare for a squeeze.
I actually recommend splitting the difference and looking at Retiro. It’s right next to Recoleta for safety and sightseeing, but it connects easily to Palermo and the more central areas like Microcentro without having to commit to one vibe.