We had an extremely disappointing stay over New Year's weekend. Check in process was simple, but everything after that went downhill. The condo had garbage strewn around everywhere--both inside and outside, multiple things were broken (toilet paper holder, toaster oven, etc), host personal items were left out such as humidifiers in bedrooms filled with dirty water and growing black mold on them, and lights in bathroom did not work for our entire stay. Meaning we used restroom, showered and bathed our children in the dark each and every day. Very disheartening and horrible experience. We reached out to the host and shared some of this feedback during our stay, particularly about lights not working in bathroom and he told us to try the fuse box, to which we did and it did not fix the issue.
In order to try to enjoy our time in the mountains, we held off on sharing the rest of our feedback until our departure, to which the host was unreceptive and would not take any responsibility for the disrepair and filth of the condo + our experience.
There are plenty of options around Mammoth, I'd skip this one if I were you.