I went to Aquarius Bath a few months ago and was creeped out by it. It was dark and dingy and full of guys wearing towels seeming to walk around in a daze. I only saw two women there and they weren't attractive at all.
Having said that, a woman would have a free pick of any guy there, so that's to her advantage. She may find that a few of the guys are too upfront and pushy, so beware of that if she'll be uncomfortable with this.
Although it was dingy, the place was very clean and the front desk service is very friendly and helpful.
Give it a shot and see if she'll like it, you never know. Good luck!