The Mandarin Oriental is wonderful, a proper oasis from the hustle, bustle and noise of the strip. We were there in early May for a few nights and the service, food, rooms etc were all faultless. The pool is (relatively) small, but that means quiet and at no time did we struggle to find a free pair of beds. There is no casino, but the Aria, Bellagio and NYNY floors are all within 10 mins walk. I wouldn’t stay anywhere else in Vegas.