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...
On a hot day there is nothing better to do in London then go for a swim in the Heath ponds. You get completely transported you out of the city as Hampstead feels like being in the countryside except you're in central London?!
I’m not sure what I like best about this deli: the speck which was so good that I ‘accidentally’ ate the whole package of it before I got home, or the fact the staff are always so friendly even when I ask for my order in my terribly rusty Italian.
I probably spend too much time here but I love it for the atmosphere. During the day it’s quite empty. The proprietor is often dozing in the back corner and you can read for hours with just one cup of tea without anyone bothering you. It picks up in the evenings as all the regulars pile in with pre-bought bottles of wine.