Turned a drafty hallway corner into a reading nook for under €100, what would you add?

Our flat has an awkward corner by the window that nobody used because it was always cold. With the cold snap I finally sorted it: thrifted armchair, thick rug, a cheap floor lamp with a warm bulb and a draft snake on the window ledge. It's now the spot everyone fights over. What's the one small thing that made your cozy corner actually feel cozy?