To anger my own question I called them up.
It's hidden not a shop, hAving seen the alleyway in question probably best to make your first visit in daylight.
Pleasant English sounding lady answered saying one girl working. Prices 'from' 60 for half an hour. She said you'd definitely get a HE but best to speAk to the girl 're what service was on offer.
So who will beat me there?😀