It's not a walkin...so don't go expecting to do that, you have to set it up in advance.
I haven't been to see her in awhile, but Marie-Soleil would return my call as soon as she was free and checked her msgs. The only issue I ever had was that sometimes she'd book me for a time, I'd go and she wouldn't answer the door 'cause someone else was still there. So ya had to wait...go down and sit at a bar down the street to kill some time...
When I saw her in the summer, she was by herself in the place (it's her business anyway). I tried calling her about a month ago and some other woman answered that only spoke French and kept saying "she busy..." and wouldn't take a msg (couldn't understand) and wouldn't let it go to voicemail so I could leave her a msg. So I have never bothered since...