Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.1030 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)

"if my SO also ends up getting the Chse/Hyatt, can our 2 free nights be combined for FOUR?"

If you want four back-to-back nights at the same property, you would have to find a block of four nights where "standard" rooms are available. Then, one of you would book the first two nights, and the other would book the last two nights. It's possible that the hotel would have you switch rooms after the first two nights, but my guess is that that does not happen very often.