Yes, went there a couple of times a year or so ago. It's in Harmer St, a dingy ground floor flat.
They're pretty unreliable; I've been sat on the bench by the clock tower a few times waiting for a return call to say it's ok to go in. They seem to double book or run late.
I've never seen Sasa, but have seen Mimi, around mid 40s slightly plump and unattractive and an older lady I can't remember her name. Neither were brilliant masseuses and are after the extra £40 for B2B which is pretty lame, and I suspect more might be on offer if you were interested or remotely attracted which I wasn't.
There are better options in the area, depending on what you're after.
LR