Whitecross Street, Islington, is just around the corner from the Old Street roundabout and is the beautiful street on which I used to live (in, admittedly, a not-so-beautiful flat).
Having said that, I absolutely adored living there and frequently go back to visit purely for nostalgic reasons. Whitecross Street is home to some of the best street food in London, with a market which takes up the entire street from 11am to 3pm, Monday-Friday.