My all-time favourite place. Whitewashed ex-smokehouse where Fergus Henderson pioneered the resurgent interest in offal dishes. The restaurant is brilliantly unfussy, retaining lots of the smokehouse’s original features, and the food very British, making St. JOHN something of a London institution. The restaurant has a winery and bakery.
Slightly biased as this is where I live, but Stoke Newington is great place to spend lazy saturday / sunday afternoons getting sloshed with friends. There are 10 + pubs within walking distance who all are great places for one reason or another. I'll pick out the White Hart for its huge beer garden...