Well, not really to be honest... you see, the problem is that when one goes out for lunch/dinner, one tries to do it in a different neighbourhood (...go "out", that's the purpose) so I almost never lunch/dine in the 'hood' :)) Having said that, here some restaurants in the district that you might want to have a look at:
-ABAC: for a great dinner on Michelin-star restaurant with chef Jordi Cruz and on a very beautiful garden. Not cheap, though!
-El Pinxus: great tapas
-Blavis, for sophisticated and delicious Mediterranean cuisine
-Mirabé, located on the slopes of the Collserola Hills, with impressive views of the city
-Bonanova, a typical no-frills Catalan cuisine restaurant
-El Asador de Aranda: superb place, especially if you like meat (steaks, etc)
-Coure and Hisop, both very close to each other. Cheffy and a bit pricey, but quite good.
-Freixa, another great Catalan traditional cuisine restaurant
-Il Giardinetto: for a medium-priced Italian with fusion cuisine.
-Vivanda, simple Mediterranean food in a lovely small garden.
As per coffee, you'll find plenty of places almost at every corner. For example, around the fresh food market by the metro at El Putxet.
Note though that all this district is considered to be a medium-high income area hence prices in many of the restaurants aren't as cheap as in other areas of the city.