RELIABLE ISTANBUL AIRPORT TAXI OPTIONS

Oooh dear… I am just cheated because of the taxi driver… lol… He billed me three hundred TL from Sultan Ahmet to Umraniye… He employed crossing tunnel from european to asian aspect… his taxi is business enterprise taxi (blue a single)… bla bla bla… The hotel personnel said that Generally all-around 100 TL. Who is right?It is always pr