If you can, get a room in the Augustus Tower or the Palace Tower. These set of rooms are the newest and fanciest, with flat screen TVs, fancy tubs and separate showers. They do cost more, but rooms have more marble than the Italians, great floor-to-ceiling windows, massive beds, first-class sitting areas and large TVs, and much more. Ask for the Augustus Tower and see if you get it, usually it's a pricey premium over the regular rooms. The cheapest rooms, in the old towers, are average at 350 s.f. and up, nicely appointed, but nothing to brag about. The least nice of the towers is the Centurion Tower, try to stay out of there.
Service here depends on how much money oyu have (and can be seen). It's a huge place and unless your Britney Spears, it's easy to be forgotten... Ok, maybe that wasn't a good example.