I will first say that Joe was a very accommodating and fantastic host.
The house itself is very spacious and perfectly located in the heart of Wicker Park. You are are within walking distance of bars, shops, and restaurants; however, far enough away that nightlife noise is no issue. The house comes with some great amenities, including a pretty insane steam shower, an outside patio, and a full kitchen. You are less than a 10 minute walk from the blue line train stop (Damen), which can also conveniently get you down town or too and from O'Hare airport.
As far as space, our party had 9 so we had no issue. If you have 14 I still think there is plenty of room, as extra cots with pillows and blankets are available in addition to the three bed rooms and two pull out couches.
Overall, I highly recommend this spot. I cant imagine many greater options in this area that can accommodate such large groups.