well I am lucky - I had a french friend looking for a flat so she found a flat for both of us.
Before coming here everybody kep telling me that it is very hard to find a flat in Paris - i didnt believe me, but it's true, it really is. You must need someone french to give guarantees for you, that you have the money.
Plus, most of the flats are unfurnished here - i got a flat (2 separate rooms) for 1200 euros, so in totally we need to pay this when moving in one: 1200 for the first month, 1200 for the last month AND 1200 for the agency!!! that's definately too much, i feel like I am being robbed - AND the flat is unfurnished.
So it might be easier to check some colocation sites (just be carefull with craiglist, where are too many scams there) and try to rent just one room - it would be easier. Though you would have less freedom, for me it was important that I would have the chance to host my friends, family when they would come to vsiti me..