Great little independent bookshop in central London run by Tamsin Clark. Weird and wonderful selection of photo books, magazines, artist books, poetry and more.
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...