I stayed at Kevin's place for about a week in July with five friends, and we were really happy with it. The location is great - very walkable, lots of restaurants, bars, and shops, and there's good access to the bus and the el. The penthouse is huge and there was plenty of space for us all to hang out together or apart. The kitchen is stocked and great to cook in - we did a lot of breakfasts in before heading out for the day. The beds were super-comfortable, too. The best feature, though, is the upstairs balcony - there's a grill and a fire table, and it's a fantastic space to hang out in and look over the street and towards the downtown skyline.
We also appreciated how accessible the space was - one of our friends uses a wheelchair, and it's very hard to find a place that she can easily get into and get around in. Although you can't get into the building unassisted if you are in a wheelchair, once you are in, accessing the elevator and getting into the penthouse is very easy. There aren't any uneven transitions between rooms on the main floor, and all of the main floor space is large enough to navigate easily. The main bathroom has a shower with flat access, and we found a shower chair in a closet, so that was a bonus. Although I don't think the penthouse is deliberately kitted out to be ADA-compliant (no grab bars, etc) it was great for our purposes.
We had a couple of questions while we were there, and an issue with a smoke detector that needed to be replaced, but Kevin was extremely responsive and took care of everything quickly. He was very friendly and helpful throughout - a great host!