It's sleazy and lovely. Its been around since 1993 and its always dependable. The opening hours are quite late in the weekends, so for many party goers this is their last stop of the night.
The subs and sandwiches are not the most fancy-looking, but they do taste good. Icelanders have the habit of eating before their evening of crazy parties come to an end and Nonnabiti is most often the first choice.
Weekends sometimes get a bit messy here. Drunkards impatiently waiting for their sub can sometimes spoil the appetite.