My dad and I went there last year and if you don't have a place by now for race week you're probably SOL. If you're planning on riding over then if you can find a place for race week you may be out of luck for a ferry booking.
What we did was we went over for practice week and loved it. No crowds, still got to watch all the practices every day, and was really easy to get from one place to another. Wasn't hard to find a place either. We flew in but I believe there were a lot of ferry crossings still open for that time too.
Honestly, if I go back, I'll go back for Race Week again. I'd probably try to stay at the Edelweiss Hotel though; the Bushy's tent got a little "loud" at night.