I stayed here on a 3-day weekend trip with the kids. Overall, we had a nice stay and the property was just what we needed.
The condo is located on the end of the building (and has different stairs than other units, which we discovered through trial and error instead of reading the instructions ;) ). You can ski right up to the staircase if you carry your speed on cat track (bonus jump for the kids at the bottom of the hill).
The living area was just right for three people. The couch and easy chair were were comfortable for sitting by the fire and watching TV. Two barstools provided seating for meals (one more would be a helpful addition). The three beds - two twins and a king - were perfect for us.
The kitchen was well stocked with all the dishes, pots/pans, and random utensils we needed, along with some tools that came in handy for gear adjustments.
The only minor challenge, true of every condo I've stayed at in Copper, was temperature control. It's well insulated and retains heat. Running the fireplace in the evening really heated the upstairs. The first night was almost too hot to sleep, but we figured it out after that.
If you have two adults and two teens, there might not be enough seating in the evenings, depending on how much space you want.
We'd definitely stay here again with the three of us.