Polina Stroganova, director of 401 Contemporary Art Gallery The Barbican and Southbank Centre are both great places to hang out, see exhibitions, watch movies and have nice drinks/food.
I would watch a German movie.
Robert Musil’s 'Der Mann ohne Eigenschaften' (engl. The Man without Qualities).
If you don’t want to lose time waiting for delayed public transport while moving through town, check http://journeyplanner.tfl.gov.uk. It can be very useful especially if your trip to London is rather short.
Homemade Christmas cookies, Haribo.
Summer 1994, hanging out at the Sandown Pier (Isle of Wight) while trying to learn English.
I love Dover Street Market and Rose Bakery.