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)
I love to spend time in this museum, with great exhibitions about : fashion, graphic design, jewelry and toys. The bookshop is also really good. And basically... architecture !