When we arrived in Denver we had to wait a hour to check into the apartment because our lockbox was missing its keys. The host the super responsive though and apologized multiple times for the mix up.
The stay was super nice and the apartment was clean. The other only downside was that there were homeless tents all over the streets near our place. The apartment was unaffected but it was hard to go out and say no to give money to like a ton of homeless people.
The host was very nice and responsive throughout our stay and even helped us stay an extra night for our booking