Okay, thanks guys.
Looks like I shouldn't rely on late-night taxis from HK Station to Conrad, then.
I've never used Uber outside of USA. Looking at some info online, it seems like you just use the Uber app on your smartphone the same as you would anywhere else. Is that correct? I can use the app while at HKIA since there's free wifi there. I think there's free wifi on Airport Express, but I don't think I've ever used AE wifi so I'm kind of worried as to whether it'll work. Where does Uber typically come pick up at HKIA? And if I were to take the Airport Express first, then at HK Station do Uber drivers usually pick up where taxis drop you off?
If I'm feeling too nervous about this whole thing, I might just go with Marriott.