A few recommendations:
When arriving to EZE international airport, I would recommend heading downtown through:
Buenos Aires' metro system called the "Subte", short for subterráneo (underground) is very fast and efficient although some of the wagons don't have an A/C system and it can get quite warm inside.
It is worth nothing that more than one person can use a single SUBE card, and that the Subte now runs until approximately 10:30 p.m. in some locations, so be well aware of this and check the timings here.
Paying with a DEBIT card vs. cash:
You will notice that many venues within the city will ask you to pay in cash (Argentinian pesos or USD but getting pesos in return). It seems that as of June 2017, all venues generating an income beyond approx. 4 million pesos must accept your national or international debit card as a form of payment, or otherwise they may face a penalty or a shut down.
The image I have posted above is the decal you will see placed on many venues throughout the city where they are obliged to accept your debit card as a form of payment. No credit cards, please!
Our accommodations in Buenos Aires:
For this studio in "Recoleta", our host Hernán was a superb and quite quick to respond. He shared a listing of places to see, visit as well as going out to eat and have some fun.
Within the historical neighborhood of "San Telmo", you'll find this gem. It is well located to different walkable sites, and I would highly recommend this apartment!
For more info and ideas to better prepare you for your trip to Buenos Aires, click here.