I definitely recommend visiting this mosque, although it used to be a church, the mosaic frescoes inside are very beautiful, they are just mesmerizing. There is a link to the code inside, and when you hover over it, there is an audio broadcast for each mural. And yes, a small addition, when visiting the toilet, a man runs up to you and asks for 20 lira, but this is a complete divorce, there is no paid toilet anywhere, the ticket price to the mosque is 20 euros.
We recommend you to visit. Perfectly restored mosaics, exterior. The ticket can be purchased in foreign currency or in lira. There is a nice cafe with an outdoor terrace nearby. The souvenir shop is large. There are many brochures about the church and many different souvenirs.