I have been wondering about hotels and like the idea of visiting a girl their better then some dodgy flat. Most 4 star hotels I have been in you can quite easily walk about without anyone batting an eyelid especially if you are dressed decently. I take it you get the room number and just make your way up to the room?
I don't mind seeing WG's at Hotels, in fact over time I've become more comfortable with this then at a Private House, perhaps because of the ease of which you can walk in, go for the elevator and the room etc.
I've done this when wearing quite casual clothing on a couple of occasions and there's never been an issue in terms of reception stopping you to ask questions or anything, but I do dress formally these days for it to be safe.
Seen one WG at a particular Hotel a few times however where a Key Card is required to get to lifts etc, so met outside and gone in. Not ideal but doesn't bother me too much.