The Newport Beach Marriott Hotel & Spa is very close to the Fashion Island Mall, walking distance actually. This makes getting dinner, lunch, shopping, etc. MUCH easier than most of the other locations. It is a little dated and the rooms are small. They have a concierge lounge at the hotel but it is in one of the towers and kind of a pain to get to. Otherwise, not a bad hotel.

The Renaissance, I have not stayed at and therefore cannot speak to. The Irvine Marriott was a standard Marriott.

One thing I forgot to add about the Newport Bayview is that it is right off 73. This makes getting into and out of the hotel and onto the highway system a breeze. 55 and 405 are right there as well.