My school planned a trip to Paris and we stayed at the Young and Happy hostel. It´s a nice hostel and better then some of the hostels I stayed in, but it´s the best.
On the other hand, the location can´t be beaten.. The metro is nearby, there are cafés, bars and some of the major attractions of Paris are nearby. For example the Notre Dame and the Botanic Gardens are easy to reach.
I´ve been there for a week and it´s ok to stay here. The main thing is discovering Paris and not to stay at your room.