I had a great stay at Vilma's place. It is very conveniently located in Pilsen, which is a vivid neighborhood with lots of bars and restaurants, and close to downtown Chicago (only a few stops on the pink line, which is two blocks away from the house).
The unit feels like a real cosy home after you have been away for most of the day visiting the city. Everything you need is available.
At my arrival I had some problems opening the key box, but Vilma immediately responded when I called her and explained how to open it (it's actually very easy!).
Highly recommended, if you don't mind being a bit outside downtown (but in one of Chicago's better neighborhoods).