last minute accommodations in Paris

Hi all,
My traveling partner and I are leaving for Paris tomorrow morning as part of our Europe tour. We had previously arranged for an apartment rental but was dropped at last minute due to the apartment owner's personal emergency. We are now lost as it seems that so many hostels, etc. online are booked for the week. Any tips or ideas on where to go for cheap places to sleep, for a week? (6/14-6/21). Any help would be appreciated - thank you!