We enjoyed our stay at Bonnie&Killy apartments, a few highlights:
1) Location is central to downtown Denver, which comes with it's perks (easy access to bars&restaurants, DPAC is literally next to the building) as well as some people traffic around the building
2) Very spacious apartments, and it looks exactly as it is on the photos with large windows and tons of space!!!
3) Apartment is on the second floor, so you are exposed a little to the street noise (though you will not hear anything with maybe the exception of sat nights when everyone is out).
4) Due to building design, this section has just 2 floors, so you do not have any noise from neighbors at all.
My gf and I enjoyed staying at Bonnie&Killy's apartments and we would definitely consider it anytime when we will be back in Denver!!