I think, generally, when a lady takes an outcall booking in a hotel, they check with the hotel to confirm that you you are genuine. Alternatively, you let them know your room number once you are checked in and they call the room to make sure you are genuine. The problem with some hotels is the lifts are 'key carded' and only the guest can get access to their room, so you may have to meet the lady in the lobby or the bar. I have done it in the past and it's worked out fine. The escort will always be dressed discretely so you could just be meeting a business/work colleague.
Picking the right lady should take a lot of your nerves away.