Although our official recommendation is to follow guidelines provided by the Argentinian consulates and embassies, we have compiled visa information for your convenience. As of September 2015, you can enter Argentina as a tourist for up to 90 days without visa if your passport is valid for the whole period of stay, and has been issued by: Australia⁴, Austria, Barbados, Belgium, Bolivia, Brazil, Bulgaria, Canadá⁴, Chile, Colombia, Costa Rica, Croatia, Cyprus, Czech Republic, Denmark, Ecuador, El Salvador, Estonia, Finland, France, Germany, Greece, Grenada¹ , Guatemala, Guyana, Haiti, Holy See, Honduras, Hong Kong² , Hungary, Iceland, Ireland, Israel, Italy, Jamaica¹ , Japan, Korea, Latvia, Liechtenstein, Lithuania, Luxembourg, Macedonia, Malasia¹ , Malta, Mexico, Monaco, Montenegro, New Zealand, Nicaragua, Norway, Panama, Paraguay, Peru, Poland, Portugal, Romania, Russian Federation, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, San Marino, Serbia, Singapore, Slovakia, Slovenia, South Africa, Spain, Suriname, Sweden, Switzerland, Thailand, The Netherlands, Trinidad and Tobago, Turkey, Ucrania, United Kingdom of Great Britain and Northern Ireland, United States of America⁴, Uruguay, Venezuela³.
  ¹ Grenada, Jamaica, and Malasia: the maximum stay is 30 days only
  ² Hong Kong: the maximum stay is 30 days only and you need British Passport BNO
  ³ Venezuela: the maximum stay is 60 days only
  ⁴ Australia, Canada, and USA: you need with no exception to pay a Reciprocity Fee online prior to departure. Note: The reciprocity fee  for USA citizens has been suspended on 3/24/16 for 90 days, please check its current status before traveling.
If the country who issued your passport is not listed above, please contact us immediately. You will need to apply for a visa.

Buenos Aires is served by two airports. The main international airport is Ministro Pistarini Airport, also known as Ezeiza, located about 30 km from Buenos Aires. Many flights to and from neighboring countries use the smaller Aeroparque Jorge Newbery airport, a short distance from downtown.

From Ezeiza

By taxi: as you exit customs you will find several booths offering taxi services, where you can prepay your trip.
Manuel Tienda León is a well established company also providing coach services. A trip downtown costs AR$595 price checked on September 2015. Another good option is Taxi Ezeiza, they charge around AR$450 pesos. You will find their desk further out, in the main arrival area of the airport. Hailing a curbside taxi is not recommended.

By coach: Manuel Tienda León offers bus trips to their Av. Eduardo Madero 1299 for AR$145. The coaches leave every half hour, less frequently during evenings. A smaller, shared van will deliver you to any downtown address for an additional AR$40 pesos.

From Aeroparque

By taxi: You can prepay your trip at the desk of one of the taxi agencies at the arrival area of the airport, such as Remis Transfer Express, Remis Trans Air or Manuel Tienda León the trip will cost you around AR$210 pesos. There are also taxi stops (with usually a long line) just outside the airport international and domestic exits.
Hailing a curbside taxi on the street is not recommended.

By coach: Manuel Tienda León offers bus trips to their at Av. Eduardo Madero 1299 for AR$60 pesos. The coaches leave every half hour, less frequently during evenings. A smaller, shared van will deliver you to any downtown address for an additional AR$55 pesos.

To get around while in the city, a good reference is wikitravel.org. The subway network (subte) reaches most touristic attractions, and several bus lines (colectivos) go all over the city. You can plan your route here. Bus and subway rides cost less than AR$5. To use buses and metro, you need to buy an electronic ticketing card called SUBE and add some credit to it. See the map of selling locations. The card costs less than AR$30.

It is usually safe to walk in touristic areas in the evening though you do not want to show up appealing electronic devices. There are pickpockets: do not leave your belongings unattended in restaurants and bars, and -especially in buses- always keep your bagpack and purse in front of you, and your money in your front pocket.  It is not recommended to walk in deserted streets at any time. The usual precautions when traveling need to be applied here too.

July in a winter month in Buenos Aires.The average temperature is 12C (53F), while the average low is 8C (46F) and the average high is 15C (59F). Average humidity is 79%. Chances of a sunny day are around 32%, while there will be around 38% chances of a cloudy day and 21% of rain.

Electric power supply in Argentina is alternating current at 220 volts, 50 hertz.

The Argentine currency is the Peso (ARS).  Information on the official exchange rate at Banco de la Nación Argentina

Restaurants:

It is customary to leave a tip equivalent to 10% of the bill.

Taxis:

No tip expected, but it is standard to round up a little.

To find updated lists of attractions in Buenos Aires, please visit TimeOut Buenos Aires. If you are planning to spend a weekend in town, it might be worth visiting the delta of the Paraná river, an area known as Tigre. More on official website.