If you are looking for a furnished apartment in Buenos Aires, I can help you find it. This is a free service for students who take more than two hours of class per week. I know a real estate agent who has a good selection of apartments with good value for money. I can recommend her because some of my students have rented apartments from her in the past and have been satisfied.
The link to the blog below is also a small list of apartments and rooms in host families. I have been in all of these apartments personally because my students have rented them in the past and so I can recommend them. They have all the qualities I consider essential for an apartment: sunny, relatively quiet, good value for money, located in a nice and safe neighborhood. http://gabrielaferrante.blogspot.com.ar/
Or, if you have already found an apartment you like, I can go visit it in person if the real estate agent allows it. Unfortunately some real estate agents don't show their apartments to potential customers; in this case I can at least go check out the apartment building to see the area, the particular street its on, to make sure there are no construction sites next to the building or that the apartment is not above a noisy bar. These things rarely happen, but its possible. After visiting the apartment/apartment building, I can give you a report in detail of what I have seen and some advice and recommendations as to location etc.