Yes of course, if you are the first time in Istanbul and you do not have acquaintances in this city, then you simply need a guide-guide, and Russian-speaking. I would advise him to be a Turk but with a good knowledge of Russian and of course it's better that he be individual, that is, you have him alone, and he has you too, then you can visit not only official sights, but also wander around just Old Istanbul , see the small streets of the Ottoman period, the ruins of walls and small temples of Constantinople.

The approximate cost of an individual excursion depends on the program you choose and, of course, on the friendly relationship between you and the guide.

For example, a night walk around the Bosphorus on a boat (the minimum group - 2 people, the group gets a guide) will cost from 60 to 80 EUR, entertaining program and meals are included. There is certainly a similar program on a private yacht, but this is more expensive for a lot.

General tour of Istanbul for the whole day, duration about 7-8 hours with visiting the main attractions - its cost will be about 150-180 EUR.

It is also possible to compile an individual program and separately calculate it at a cost or designate the cost and the cost of choosing a program.

It is better to book an excursion in advance, but you can apply and already in Istanbul.