Badrutt’s Palace’s official Hitchcock Suite page says the suite hosted the director many times. St. Moritz Tourism and Swiss Deluxe Hotels independently document his 1926 honeymoon with Alma Reville, Suite 501 and his long pattern of returns.
Alfred Hitchcock stayed at Badrutt’s Palace Hotel in St. Moritz repeatedly, including during his 1926 honeymoon with Alma Reville. The hotel’s current Hitchcock Suite page says the suite hosted the director many times, while St. Moritz Tourism and Swiss Deluxe Hotels preserve the honeymoon, Suite 501 and his long pattern of returns.
Source conclusion:
The cited sources support a stay at the named hotel.
