When mention about hanging out in Paris, one could mean sitting in the cafe ... This is because you can pay only 2 or 3 Euro for coffee (normally espresso) and sit with small table as long as you want (without any waiter or waitress to ask you to move or order more).
Therefore, it is a must for Parisian to choose a café with an interesting view to sit back, relax, and see or take everything that goes by. However, there are some people who read or work on a laptop computer, which are not wrong for being in cafe. Cafe prices vary from area to area depends on proportion to the number of tourists since some of famous cafe means the one that tourists really need to go even coffee is more expensive than other places (I count at more than 3Euro per cup mean expensive) ... Just like Les Deux Magots in St German des Pres
But we went to Les Deux Magots ourselves ... once in a life time ... need to take this great opportunity (as tourists) -- since I don't know when I will be in Paris again.
Les Deux Magots name came from the two wooden statues of Chinese commercial agents (magots) that adorn one of the pillars of the cafe. This place has a reputation of meeting place of the city's literary & intellectual elite, philosophers including artists or writers such as Ernest Hemingway.
Another famous thing about Les Deux Magots is old-fashioned hot chocolate ... Here was the look ... Chocolat Chaud (7 Euro) and coffee (4.40Euro) - Both were served in small jug with price that more expensive than other cafes (but more delicious - thicker of chocolate but no after taste or dry out while coffee was so aromatic).
Les Deux Magots
6 Pl St-Germain-des-Pres 75006
Tel : 01 45 48 55 25
However, there were also another famous cafes in this area such as :
1) Cafe de Flore (172 Blvd St-Germain 75006) : The classic Art Deco interior with all red seating, mahogany, and mirror. Also another place that used to be for French intellectuals and Philosopher such as Jean-Paul Sartre and Simone de Beauvoir.
2) Brasserie Lipp (151 Blvd St-Germain 75006 - just opposite to cafe de Flore) : This place was opened in late 19th century combines Alsatian beer, sauerkraut and sausages with excellent coffee. The interior is bright with ceramic tiles of parrots and cranes. Visitors were mostly French politicians and fashion gurus.