They have a few hotels in MCO since it's a hub (err, "focus city"). When I was there for AO Initial a few months ago, I was at the Holiday Inn Express. They also use the Crown Plaza and a couple other ones all in that cluster there just north of the airport. All of them have a shuttle that'll get you there in about five minutes or so.
If you're wanting to have them visit, on the first day of training, get onto the corporate intranet, go to Crew Travel, and get the form you'll need to fill out to authorize your fiance as your significant other. Fax it in as soon as you can, since it can take a few days to process. As soon as it's in, you can list yourself (or him/her) on MyIDTravel, although you can't fly until you have your badge, which comes in the second week. I went up to Martha's Vineyard on a day off, so you can fit it in if you really want to... I wante dto take advantage of being on the east coast since I'm in Seattle, and it's difficult to connect anywhere on JetBlue from here.
Any other questions, drop me a PM. JetBlue's a great company to work for; there's a reason that they haven't gone union yet -- we're treated well. I've met some of the ground crew in ROC and they're good people, so you'll enjoy yourself.