At the onset, I would still like to believe that viator is a professional company and our next experience/ s would be better. Not giving up on you guys.
This tour was however marred by:
1. Change of vehicle 5 times between minivans and big tour buses
2. Promised a merc minivan but made to sit thrice on the big bus
3. Accordingly, the group size kept changing from 9 to 25 as against a promised 12 max
4. Tour guide was excellent but most of the times kept speaking to the Spanish guys in Spanish leaving us to the the other tour guide who was generally addressing a bigger audience. Logistically difficult. No complaints against that tour guide specifically but this is not what we had paid for.
5. I had to raise this issue with your local support a number of times but he expressed his inability to deliver us exactly what had been promised in the package

The local support was a decent guy, gave us a complimentary night cruise but it was with 250 persons. Though it was decent however that's not why we booked our tour through viator.

This tour was very good to see the other side of Istambul. The Dolmabahce Palace is really amazing and worth to see. The tour guide could have told us more about the history of the place.

Brilliant tour! The views from the Bosporus were fantastic.Eren,our tour guide was great as he explained the history behind important buildings

Awesome tour. Dolmabahce Palace was stunning. A good way to get your bearings of the city in your first few days.

We were lucky having Unal Aydin as guide in this tour. The hall journey was so exciting and informative.
This tour was a reference for us to compare other tours and guides. It wasn't easy for the others. If we will have the chance to comeback to Istanbul, we will look for sure for City of Sultans and ask for Unal Aydin.

The Dolmabahce Palace was not available because it was closed on the day that we booked the tour. This was not the tour guides fault and we knew it in advance. We did an alternative attraction. The tour guide was knowledgeable and very pleasant. Would suggest that you book on the day that this palace is available.

Great tour guide, interesting sights, great cruise! Weather was perfect, group was small. So glad I chose this tour!

Excelente. No pudemos ir Dolmabahe porque estava fechado, mas a visita foi substitu□da por um almoo e pela visita ao Centro da Igreja Ortodoxa em Istambul.
O cruzeiro pelo B□sforo dispensa coment□rios. Tivemos a sorte de faz□-lo num dia de sol e c□u azul.
Nossa guia tamb□m foi □tima. Escolha perfeita.

The tour was worthwhile and interesting. Our guide was very knowledgeable and accommodating. My wife fell ill on our booked date. The owner very obligingly rescheduled our tour date as he turned up in the hotel lobby to pick us up.
I would definitely book through City of Sultans again.

Great tour.