Cassie's place in the Highlands was more than accommodating, even without furniture! It had all the essentials, a clean kitchen with all the appliances (fridge, sink, microwave, silverware, plates) and a fully functional bathroom with shower. Although there was no bed, we brought our own (aerobed) and it worked out perfectly. If this is not an option for you, you might want to look elsewhere.
As far as the check in/check out, it went very smoothly, there is a private entrance with a lockbox: no need to coordinate a specific time of arrival.
The vibe of the place was great. It's tucked away in the highlands (top rated neighborhood of Denver) and it felt very cozy yet spacious. There is a bedroom with a space heater in the unit where we planted our air bed. It has a closet and enough space to store your baggage/clothes away in. It became our little home away from home while we visited :)
Overall Cassie's place is more than comfortable enough for a visit to Denver and beyond. It was our base camp of sorts as we ventured off into the mountains or the city for the day. The simple coziness of the bedroom combined with the spaciousness of the rest of the unit made it very livable. Would rent again!