In the third of our dispatches from A Room for London – a hotel installation in the shape of the boat in Joseph Conrad's novella The Heart of Darkness – we hear from the distinguished Swedish historian Sven Linqvist, whose works include Exterminate All the Brutes and A History of Bombing.

For four days every month, as part of a year-long project by Artangel, a writer will stay in the boat, which is moored on top of London's Queen Elizabeth Hall, tasked only with writing an essay on the theme of London, rivers and/or Conrad. Lindqvist spent his 80th birthday in the Room, where he produced an essay on the city, art and impoverished childhood.

During the year we are also live-streaming a series of concerts from A Room for London. You can catch up with the third in the series, by Laurie Anderson, here.