I usually do not have any problem just going straight to the gentleman's room.

If its a provider with no reviews and you are TOFFT - meeting in the lobby might be the better idea since if she turns out to be soemthing you weren't expecting she has no way of knowing which room you are in or trying to rob you since you are both out in the open.

Also some providers dont mind meeting at the hotel bar for a quick drink if you perfer to do that.