Delano at Mandalay Bay was a great place to stay. Four stars is because our original room had noise from a huge air conditioner outside the room, the room view was nearly level with the top of the parking garage, and the toilet was running continuously. Avoid room 04-810. They did give us a better room the next day, room 18-902, much better!
The very short walk to the casino was no issue, and the overall accommodation was great. I would recommend a stay at the Delano.