If you follow E’s directions carefully, it is easy to find.
map gps worked too. I had no trouble taking the public bus No 16 directly from the International airport to Taskim Square. Normally takes an hour, but I hit rush hour traffic so very slow 2 hr 20 min from 5-7:20 pm
87 lira bus fare. Much cheaper by far than a 45 min taxi (without traffic) I took returning to airport
The bus stops (and picks up) right next to a hotel.
From there it waa about a 12 minute walk (in the rain) across the square with beautiful view of the illuminated mosque. Great location.
I recommend visiting the Galatea Tower! It is self guided. Fabulous views and very impressive exhibits set up by Istanbul Library. Good cafe Viyani’s there near the ticket booth. Next time I stay 2-3 days.