It's not recommended to rent a car in the city as the driving and traffic are horrendous.  However, taxis are very cheap and will get you to anywhere you'll want to go.

 While taxi related crime is rare, it does occur. The most prudent thing to do is to request the hotel to phone for a cab when you want to go out. If you take a cab from the street, look for Radio Taxis ( The term Radio Taxi) will be written on the side of the cab. As you enter the cab, look for a large clear plastic envelope that contains identifying information about the cab and its driver, complete with picture. Do not take a cab that is missing this vital piece of information.

Taxis are plentiful in Buenos Aires.  The drop stops at 1.96 pesos. Expect to pay 6-12 pesos for most rides (2-4  dollars), although if you are going longer distances the fare may be higher. For example, from Palermo Soho to a tango show in San Telmo, the fare should be about 20 pesos (7 dollars).

Have a sufficient amount of peso coins and/or 2 and 5 peso bills to enable you to pay the exact fare after rounding to the next highest peso.  Even radio taxi drivers will often claim not to have change for a 10 or 20-peso note.  If you have only a 50 or 100 peso note, forget it!