The after hours check-in experience, though a bit out of the way (had to drop by the office in Silverthorne), was alright. The instructions for the following day were, however, incorrect - turns out, we could've just called to extend our temporary key cards instead of driving again to the office, per the welcome packet.
The amenities were nice (parking spot, hot tub, gym, dishwasher, boot drying rack, ski locker) but the stuff that really mattered left a lot to be desired.
There were three of us (two in the bedroom, one on the sofa bed) and all three of us hated our beds. The sofa bed (where yours truly slept) was worse than my camping sleeping pad. I mean, much worse. I longed for my camping gear, actually. Similar complaints were heard from the bedroom dwellers. All in all, very little sleep was had over our stay.
Separately, there were not enough towels provided for three people to actually take advantage of the hot tub and pool - we had to wash our towels each time.
Also, the walls are about as thin as two sheets of paper.
The location was very convenient to the Mountain House base though, 10 min walk in the morning more or less.
I would rate this much higher if it weren't for the fact that we ended our trip much more sleep deprived than we should've been. The essentials matter more than any additional amenities.