The biggest improvement in OSX Yosemite is that adjusting the volume no longer makes that annoying noise by default. You can still hear a noise if you hold SHIFT while adjusting volume, but its now a power users only feature.
Lobby is nice. Room is passable. Serious elevator problems. Elevators were constantly slow. After waiting for approximately ten minutes for an elevator to leave for the last time (only two stopped at the floor during this duration and they were both packed full) I gave up and carried our luggage down nine flights of stairs.