Four Points by Sheraton Sheik Z Road
I had no problems bringing a girl back during the day because she just blended in with the other tourists etc. They also have a back entrance that is much more discrete.
I spoke to a few girls in the evening mainly at the Premier and some were not sure if it was GF in the evening. I told them it was but the feedback was mixed. It's good to get feedback from the girls because they will know more than most of us as long as they are not new to Dubai. The Russians seemed to think it was ok, the Chinese were not sure.