Even though the house is in a great location and has beautiful art in it, we had a real problem with check-in and cleanness, so much so that we've had to leave on the first evening and go to a hotel room. At some point during the night, the house was invaded by moths flying all around the place, so much so that they were hitting us in the dark, and we couldn't sleep. We didn't open any windows, so I guess those bugs were coming from the house.
We communicated the problem with the house manager and left the place at 11 pm night to find the hotel because it was not possible to sleep in rooms full of flying insects. The host was responsive, but only to trick us into accepting half of the refund claiming that Airbnb would cover the rest. He claimed that it is normal to have moths in the house at this time of the year in Denver.
In addition to that, already very late check-in (4 pm) was delayed because the cleaning guy was there when we arrived, and we couldn't get into the house until 4:30 or 4:45 pm. In general, the house was not very clean, and we could see that the host didn't even change the bedsheets.
Overall our experience was awful, and we've never got a refund for something that would be unacceptable by any standard. Please be aware, and if you are not happy with something, don't trust the host. He is not the owner, and he will trick. Contact Airbnb directly.