The host upgraded me to a private studio for free! The apartment was modern, squeaky clean, nicely furnished, with floor heating, kitchenette, dish washer, free parking, complimentary toiletries, and stable free wifi. I even got a tourist card from the reception which enabled me to take the cable car to Diavolezza for free (that saved me 40 chf!)
The location is not in downtown St.Moritz, but I definitely prefer St.Moritz-Bad because it's super-close to the lake, the ice skating rink, and the spa (Ovaverva)
To summarize: absolutely recommended!!