Hi Andrew,
I'm sure Monica has filled you in already here, but the starboard Parlour Suite (C-55, 57, 59), was occupied by Isidor and Ida Strauss, who, according to a letter sent from the ship, were delighted with their new accomodation. The port-side suite (which I believe encompassed cabins C-62, 64, 66) was originally thought to have been occupied by Col. Astor and his wife. However, according to recent research - conducted, I believe, by Daniel Klistorner - they were berthed elsewhere on the ship.
Hope this helps,
Ben