My son and I are on an adventure in Istanbul, Turkey. We rode the overnight train from Bulgaria and arrived ready to explore! We’ve had a wonderful time and I’ve found the city to be a relatively kid-friendly destination.
There are a smattering of parks around the city, with Gulhane Park being one of the nicest. Not all of the parks have soft surfaces under the equipment and my son did take a spill on a cement surface and managed to fall on his forehead.
We have walked quite a bit around the old city, but it has been a bit difficult with a stroller. There are lots of cobblestone streets and narrow or non-existent stretches of sidewalk with streets filled with cars and buses that don’t yield to pedestrians. The streets in the old town can be crowded, but that can make them more interesting and safe. There were a number of outdoor staircases, requiring me to carry the stroller. I would recommend using a baby carrier if you have a younger child (and a strong/healthy back).
We have enjoyed eating in restaurants and most have had at least a handful of vegetarian and vegan options. Some of the cooked veggie and white rice dishes have quite a bit of oil unfortunately, but the lentil soup, salads, and hummus dishes have been great. Most of the grains are refined (white bread, white rice, etc), but I did find cooked bulgar in some restaurants. A few restaurants that catered to tourists did have high chairs, but most did not.
They have a nice selections of raw nuts and fresh and dried fruits available at the markets (in the summer at least) and many vendors sell fresh squeezed orange juice for as little as $1 a cup and fresh pomegranate juice for a bit more.
We stayed in a hotel in old town, so we would be within walking distance of the Blue Masque, Hagia Sophia, and other major attractions. It made it easier to visit some sites between naps and dinner. There is a decent public transportation system, but it is often quite full (and thus difficult to bring a stroller on).
There are a bunch of different boat tours available on the Bospherus, with excellent views of the European and Asian sides of the city. We also took a day trip to the Black Sea and enjoyed playing on the beach.