I had a colleague who visited this club, and he was promised a free entrance to the said club. However it turned out to be a pitfall
as he was later charged around 600 euros on his credit card! Some "free" entrance, huh?
Mephisto really sucks, first of all it's located in the infamous Vaci utca district. Second, it's a shady place to transact business,
so your friend better watch his wallet.