「Small street with bars and restaurants and lots of people in evenings」
Went there just incidentally. I was surprised by amounts of people present. The bars and restaurants were quite occupied and many of the visitors were just staying and chatting in the street. I think that this is a good place if you are looking for night life and some adventure.
The church is of course a secondary attraction in Paris, but as it was about a 5-minute walk from my hotel, what the hell? It's next to the Saint Ambroise metro (of course), has a little park in front of it, and next to the park/metro there is a bar if you want to have a coffee while admiring the...