Best bet for researching hotels is
I'm curious: why Orlando? if it's for the theme parks, they're mostly (all?) located to the south of Olando. We're just back from there (stayed at Hilton at Walt Disney World, which was very good by the way), and didn't go near downtown Orlando once. In other words, for convenience you're probably better off somewhere other than downtown.
I believe there are a couple of 5* places, but as I say, tripadvisor is your best bet, as it has loads of reviews from people who've stayed in each place.