Max's flat is perfect for a stay in Paris. The flat is in the Republique neighborhood of the 11th arrondissement. It's very hip and close to very good restaurants and Canal St Martin. There's a metro stop 5 minutes away. Not as touristy as other neighborhoods you could stay in Paris. Also close to Gare du Nord and Chatelet.
Flat itself is one bedroom with a pull out couch. only one bathroom, so 4 people would be a bit of a squeeze, but perfect for 2-3 people.