We enjoyed staying at Jon's place—there was a group of eight of us at the peak. We had events at Union Station and Larimer Square; it was a bit of a walk, but doable. Right next to the stadium and a lot of bars, if that's what you're into.
There's a lovely tub/Jacuzzi upstairs, and great decks to hang out on. There's a pool table, foosball table, and xBox, complete with a bag full of games (although I can't say I tried out the latter). Great setup for chilling with friends.
Things to keep in mind about the space:
1) The kitchen is quite limited—good for drinks or eating prepared food, but not equipped to do much cooking. There's also not really a dining room table (there's a narrow table with six seats, plus four seats at the bar).
2) The house is constructed with almost no noise insulation between rooms/floors. The house felt quite well insulated from the street and other units, but within the space, if anyone was walking around or talking within the space, you could here them throughout the entire apartment. In other words—great if everyone's going to bed at the same time, but challenging if you have people on different schedules.
All said though, the space felt "as advertised," and Jon was a lovely host, very on top of communications.