Not the most exciting place inside, but a lovely rooftop area which not all that many people seem to know about, 2 mins walk from Old St station. If it’s packed then The Red Lion is just up the road.
The closest you can get to Little Italy in the east.
The owners are amazing, the atmosphere is relaxed, the lunches are abundant and homemade.
The cakes are amazing, try Torta Clara (pear and chocolate) for the ultimate bliss.
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...
You might think the Tate Britain is the less interesting of the two London outposts: full of crusty oil paintings and pensioners on day-trips, but you’d be wrong. Not only is the building a delicious warren of interconnecting rooms, each more beautiful than the last, but it also houses a collection of pre-Raphelite works that has me in tears of awe every time I swing by.