If you happen to stroll through the 12th arrondissement of Paris, east of Gare de Lyon the train station from which you can reach southern France and Italy, if you happen to follow this rather long street called Rue de Charenton you will come across this bar called 'Le Mastroquet'.
If you like Belgian beers, I can only recommend you to make a short stop at this place. I write short but I think it could last a little more.
Why should that be ? Well, because first the atmosphere is pleasant. Second because while you sit you can enjoy looking at the 'quartier' life flowing by. Third because once you have tried maybe the beer of the month, you will feel like tasting another one.
At lunch time they also have a small offer of dishes of the day which are good value for money.