This rental is highly satisfactory. The place lives bigger than the pictures tend to show. We had 4 adults and 4 kids (13,13,11,11) (2 families of 4). We ended up sticking all the kids in the bunk room with the rollaway, and they had a great time. We pushed the 2 twin beds together to make a "king" So it all worked out.
The kitchen is slightly small but worked for cooking the daily breakfast and a evening dinner. There was plenty of leftover goods and we left extra paper towel, paper plates, napkins, and some extra things we didn't get to use during our stay. The table fit all 8 of us with the 2 extra chairs in the main closet. So that was nice. There was plenty of silverware, plates, mugs, and cups for 8. Pots and pans could use an upgrade.
The 2 separate living room areas worked as a kids / adults area and was very comfortable (again larger than the pictures show). The view from the main living area looking straight at Lone peak would captivate me every morning and evening (if you could see it between the snow!!) The sitting area in the master was a great little treat for me to come home and stretch and unwind while looking out at the mountain again.
The master shower was pretty nice (except the sliding door would always try to open, but I just put a bottle of shampoo behind it to block it) Heated floors were great after getting out.
Now for a bit of the missing 1 star. There were some inconveniences that really make it a 3.5 star for me. The pillows are pretty flat (but that is a preference thing) The bedding and "extra" bedding, and the blankets across the chairs were in desperate need of washing, so we had to do that before using them. Which leads to the - no washer and drier in-house. It's communal by the elevator, and it was just annoying to walk out and have to check it like you're in college again. Not huge, just a ding for quality of life. The fireplace was not cleaned, and not 'ready' for safe use. I had to do that, which (not huge, just annoying again). The humidifier was absolutely disgusting, the filters were full of mold, and there was sick buildup all over them. I went to Ace and bought new ones, and cleaned and disinfected the entire unit before I used it (you're welcome to future guests) It's also not big enough as a whole home humidifier, could only manage 28-30% running 24/7 on full speed. So that's a very easy $200 fix for the homeowner. The owner can't do anything about it - but the parking garage is all but a disaster waiting to happen. I had a midsize SUV, and it took me about a 5 point turn to get into some of the spots. But all of those things really mean it's a 3.5* site for me.
The drive to mountain couldn't be easier. Uncertain about the shuttle - I did see people waiting for it though. But it's literally a 3-4 minute drive to Big Sky mountain base, and about a 11-13 minute drive to Madison base. (I would recommend going to Madison base as the big sky side is just... well, the infrastructure isn't there to move people in a very efficient fashion. I know it's a house review - but you stay here to ski. The big sky side we would wait upwards of 45 minutes to get up the Swift 6, 10 minutes for the Ramcharger, but at Madison base there was no waiting to get up either lift (The Derringer 4 is PAINFULLY slow, but very kid friendly), and you can access all the mountain from the Six shooter lift. I wish I would have known that on day 1. You can cross both sides from either side.
Overall I would stay here again in a second. They just need to update a couple things, and it would be a premiere place to rent.