The very first place i've been in Paris.
My first month in the city, i spend over 800€ in this bar (true story)
It's simple, warm and friendly, drinks are not so expensive (for Paris...). You can talk with every body, people there are open minded and funny (but only because everybody is drunk)
A paradise for a rest : waterfalls, restaurants and bars (crazy parties at the top of the hills in Rosa Bonheur) As soon as the sun is shining people are going there to share a drink or a meal, lying on the grass surrounded by blazing green.