A great place to start the day if you are in South London is Federation Coffee in Brixton Village. The food is great and so is the coffee. This is a very chilled place where you can get both and indoor and outdoor experience (even though the whole place is under the Village roof).
If you are lucky enough to get a table at this tiny 6 table only Café you are in for a real treat. The coffee is great, the cakes are delicious and the staff is friendly in this traditional wifi free (meaning no wifi here) Café. On a quiet day this is the best place to delve into your favourite novel while being caressed by the easy listening aural pleasure of Classic FM. But the real reason I come here is to overhear the conversations of the other customers. More than once did I have to put my book aside to pay closer attention to the charming, wonderful and often nuts conversations going on around me. I've overheard all sorts of discussions varying from 'Psychoanalysis' to 'Proustian ideas', 'Science Fiction' to 'Greek Mythology' and 'African Studies' to 'the takeover of DC Comics'.