I also booked to have a ceaser開刀 on 22/12 and I also decided to stay in private room. for ur info, if u want to stay in private room, u have to book it in advance from 入院部 or u can phone 入院部 to book. ur doctor cannot book it for u ga!!
As I know, u must join their package if u decided to stay in Union hospital. or u may phone them for more detail. their O &G section's phone no is 26083373. Hope this can help u la.