I've been to the one above the Apple Store, you go in just round the corner. Doors open until 11pm, straight into a small foyer as you go in, with the lifts right in front of you and the stairs on the right. Reception is on the first floor, so you bypass it in the lifts up to the rooms. Great for the nervous punter. Or if you're looking for added discretion.
The other one at the back of Waverley is a lot more exposed. From memory, there are two ways in, but the main doors take you through a kind of sitting/bar/restaurant area then up to reception, which you need to walk past to get to the lifts.
When doing an in call to a hotel, I just confidently strut past reception like I'm supposed to be there.
The one above Apple is the mutts nuts though, ideal for discretion.