How much would it cost to rent an apartment in Buenos Aires?

I don't think it costs very much. My Godmother was staying there earlier this year and I think she said it was inexpensive.

AZCUENAGA AND GUIDO
PRICE: U$S 190.00/weekly, U$S 550.00/monthly
MAXIMUM CAPACITY: 2 people AREA: 25 m虏/ 269 ft虏
NEIGHBORHOOD: Recoleta, Buenos Aires
CATEGORY: studio
Description: This charming studio is a very good option to get an apartment in Buenos Aires. Located in one of the most pretigious areas of Buenos Aires, the heart of Recoleta neighborhood. You will find plenty of green spaces, historic monuments, touristic circuits, commercial areas, restaurants, cinemas, pubs and a busy night life. The apartment has a splendid open view to the west of the city, where you can appreciate a very nice scenery of Buenos Aires city. The decoration is very warm and the distribution is very functional, adapted to the structure and equipment of the apartment. It has a double bed, table with 2 chairs, single couch, cable tv, air conditioning, and the building has 24 hr surveillance.-


BERUTI AND SALGUERO
PRICE: U$S 375.00/weekly, U$S 1050.00/monthly
MAXIMUM CAPACITY: 4 people AREA: 95 m虏/ 1022 ft虏
NEIGHBORHOOD: Palermo, Buenos Aires
CATEGORY: 2 bedrooms
Description: Excellent furnished and equipped apartment in two floors for temporary rent in Argentina, located in the beautiful Palermo neighborhood, two blocks away from the re-known Santa Fe Avenue and few meters away from Las Heras Square and Alto Palermo Shopping. It is surrounded by bars, restaurants and bistro, and by a lot of buses and the line D of the subway. This apartment is on the second floor, by stairs, is ideal for four people; is painted in different colors and is very luminous. Counts with an ample living with sofas, two bedrooms with a double bed each one, a full bathroom and a totally equipped kitchen with oven; upstairs you have a bathroom with a shower and a room with a sofa that connects with a spectacular terrace with a grill to prepare exquisite barbecues. It comes complete with air conditioning, TV with cable and weekly maid service

EL LAZO AND CABELLO
PRICE: U$S 235.00/weekly, U$S 700.00/monthly
MAXIMUM CAPACITY: 3 people AREA: 48 m虏/ 516 ft虏
NEIGHBORHOOD: Palermo, Buenos Aires
CATEGORY: 1 bedroom
Description: Beautiful duplex located in the heart of Palermo neighborhood and surrounded by several green spaces, restaurants, bars, stores and above all, plenty of life. The apartment is on a modern building, located in the distinguished El Lazo path, which makes the apartment noise-free, since it is apart from car flow streets. It stands out for two large rooms and its up to date and practical decoration. It counts with a fully equipped kitchen, open to the living room, balcony, bedroom with a library and full bathroom. It also has cable tv, air conditioner, 24 hr surveillance, laundry room and maid service.-


FOREST AND ALVAREZ THOMAS
PRICE: U$S 160.00/weekly, U$S 550.00/monthly
MAXIMUM CAPACITY: 4 people AREA: 45 m虏/ 484 ft虏
NEIGHBORHOOD: Colegiales, Buenos Aires
CATEGORY: 1 bedroom
Description: This lovely duplex is located in the quiet and safe neighborhood of Colegiales. This is a neighborhood that has evolved a lot over the last few years, having new buildings and commercial areas. It is very close to Palermo Hollywood, a very trendy area of Buenos Aires, where you can enjoy daytime and nightime activities. The apartment麓s interior distribution and format is very modern. It resembles the up to date lofts we see today. It is part of a complex of same style apartments, which have, in their majority, a view to the street, which also provides an idea of independence, having the intimacy of a house, but being part of a complex. It has a full living room and kitchen downstairs and one bedroom with a double bed upstairs, where you will also find a full bathroom and a balcony. It is equipped with cable tv, stereo, refrigerator with freezer, complete set of dishes

The average cost is about 500 USD per month, but it depends on where you're staying. There are lots of people that have apartments for rent for tourists. I link to one below, just as an example. If you search for rentals in Buenos Aires, I'm sure a lot will come up.