I heard about this place from a chef that I met while he was on vacation in Boston. His other restaurant, which is equally if not more impressive, is La Salle a Manger. He left Reservoir to open La Salle.
Reservoir is amazing! The atmosphere is very relaxed with a "community" feel to it. Coming from restaurants in Boston which are usually rushed it was nice to have a relaxing brunch that lasted about two hours. I know that long meals aren't for everyone but the staff was attentive without being encroaching.
The menu: it is only in French but if you don't speak french just ask! I'm told that the menu switches pretty often, at least with each season.
The food: everything we had was amazing but my two favorites were the Pork Belly with corn/tomato salsa and the beignets with blueberry puree. Both the omelet with lobster mushrooms and crepes were equally delicious.
The beer: I only had the Blanche which was great, it would be worth coming here in the middle of the afternoon just for a snack and a beer!
I would recommend this to anyone, both native and tourist! Coming from out of town it was nice to get out of the "touristy" areas and to eat somewhere that felt much more authentic and real. 10 times better then you are going to find in Old Port.
Hope this was helpful!