Ok, so now I'm taking the time to go back in Marleybone to do some of the side quests (I don't feel complete unless I do them all) but I am quite lazy and I just wish there could be a little sign on your map that shows you if there is a new quest waiting for you, so you don't have to find the NPC's.
I think this is a good idea, for whenever I look for quests that rewards something I like, I can never find it unless i basically interrogate my friends