It's an underground station. It's on the Northern line so it's one of the older stations in London. It has a couple of lifts (elevators) or you can take the 54 steps down to the platform. I suggest the steps.
It can get a little overcrowded as it's quite small and it's the nearest tube to the Roundhouse (which has a free 'beach' on it's roof in the summer) and it's close to Camden Market. read more