Jillian's place was great for our group of 6. The price was right on, and Jillian was very attentive and quick to respond to all of our questions.
Our trip was over 4 days around the New Year, so cold weather was to be expected. Jillian was nice enough to warn us ahead of time that the bottom floor of the place tended to be a little colder than the rest of the apartment, and she wasn't lying. There's just not much that she could have done about it, but she provided two space heaters and extra blankets on the bottom floor. The fireplace would have remedied the problem even more, but we didn't make the effort to go buy firewood.
Overall the place and the location were great. Fun bars, great restaurants and the el are all within a short walk, there was a parking spot available and street parking nearby. I would definitely recommend it for your larger group.