We took advantage of our Starwood points to spend 5 nights at the hotel during the first week of April. The hotel is lovely and modern with its western ski resort facade and "hotel contemporary" rooms.
Room: As I am very allergic to cats and dogs, I asked for a non-pet room and was given one that had no trace of allergens at all. We saw quite a few dogs in and around the hotel, but I never once had to use allergy medication. The view from our room was of the front of the hotel, which wasn't bad at all even if I couldn't see the mountains as I had hoped. At times, I felt like a cat mesmerized by the gondolas going back and forth directly in front of us (although not so close they could see into our room).
Our room had full-sized kitchen, a gas fireplace, and a king-sized bed along with a queen-sized pull-out couch, which worked very well for us as we had our 14-year-old son with us. The kitchen was nice to have. We mostly used it to store our breakfast pastries, fruit, and yogurt. It would be very easy to save a ton of money on restaurants by preparing meals in the room (if you wanted to spend your vacation cooking). One funny quirk about our room - the bathroom mirror had a slight concave curve to it that made our reflections look fat. Not exactly what I wanted to see ;)
Staff: Everyone we encountered was pleasant and efficient. No complaints at all. What more can you ask?
Food: We only ate one meal at the hotel which was breakfast in the Whitebark restaurant. It was a fairly typical hotel buffet - decent food, pricey. I didn't see any other places to eat in the hotel.
Transportation: We had a car that we only used twice - once to take an afternoon trip to Mono Lake and once to the Tamarack ski center. Other than that we used Mammoth Lakes' excellent (and free) bus/trolley/gondola system to get everywhere. It has to be the easiest town to get around in that I have ever visited. The Westin also provides free shuttle service but we never needed to use it. Note: The gondola located behind the hotel goes directly to the Canyon Lodge.
Ski Rentals: It would have been very convenient to rent our ski and snowboard equipment at the hotel. In the end though, we decided to rent at the Canyon Lodge so we could leave the equipment there and not have to lug it back to the hotel every day.
Overall, the Westin is a very nice hotel in a great location. The only thing I think would improve it would be a comfortable lobby with a fireplace where guests could lounge, have a drink, and meet others. It is a ski town after all and an apres-ski lodge feeling would be appealing. They did offer free hot chocolate in the afternoon which we appreciated. We would be very happy to stay again.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC