You can find beers everywhere in Paris, whether à la pression (on tap) or en bouteille (bottled beers), but you will generally find the same international, mass-produced brands.
Thankfully, some places are specialised in bières artisanales – i.e. real ales or craft beers. And I recently discovered such a really nice bar in the district of Oberkampf.
Quite small, L-shaped around the counter where many drinkers stay, La Fine Mousse also offers a few tables at the extremities, and is rather elegant, but not snobbish.
The list of beers regularly changes, but there are always 20 different beers on tap, covering a wide range of tastes, colours or rates of alcohol, and more than 100 different bottled beers. In order to make up your mind, a short but accurate description of the characteristics of the beers is provided, and the staff is also very well informed about what they sell (I’m sure they can explain or advise you also in English).
The prices are not too high, considering the quality of the beer: a demi (25 cl) costs about € 4.50 and there’s no invitation to take a pint (50 cl), so you’d better sip and savour your demis and taste several ones, as in a beer tasting.
There’s also cider on tap and natural fruit juices, but I must admit I’ve never tasted them yet! It is also possible to eat planches of cold meat or cheese (a bit too expensive for to me, but cheese can match with a beer very well)…