There are no fixed operating hours, visitors are welcomed any reasonable hour during the day, unless there is prayer.
Admission is free of charge.
Information on Cyprus Portal http://www.cyprus.com/omeriye-mosque.html
Address 7 Πλατεία Τηλλυρίας, Λευκωσία 1016, Cyprus
Coordinates 35°10'18.866" N 33°21'56.245" E