Jeff was super friendly. The flat was even better than it looks on the pictures (amazing!) and it also came with some bonuses: fruit, cold water, some wine and an amazing coffee machine! This is the 7th place I book through airbnb and this one is the best by far.
Location is also good, as you have a bus stop that takes you directly to downtown at 3 minutes walk form the flat.
I would definitely recommend Jeff&Lisa place to anyone (and I will definitely try to repeat if I end up again in Chicago).