We stayed in Güngör's apartment for 1 week. It was the first place we stayed during our time in Turkey and was the perfect starting point for our trip! The apartment is downhill from a busy main street and is surrounded by shops itself as well. If you continue going downhill past the apartment, eventually you'll reach the water, as we did on one of our early morning walks. It's a short walk to the main Old City sights, it took us maybe 10 minutes to get to Blue Mosque and Hagia Sophia and the one of the main entrances to the the Grand Bazaar are right at the top of the hill from the apartment, across the tram tracks. The location is on a quieter side of town, in Fatih most of the shops begin to close around 8:00pm, so if you're looking for something that settles down at night, this apartment is perfect!
Important to note, it is a 5th floor walk-up. This may be an issue if you intend to come back and forth several times throughout the day, but as we were just leaving in the morning and come back for bed it was not too much of an issue for us.
The host, Güngör, is super responsive and helpful. He helped us acquire transportation cards, a sim, and even came by at 9:00pm once to help us with an issue we'd run into. I messaged him several times with questions and recommendations and he always came through!
Overall the apartment is a great choice and an even better value. I would definitely recommend it to anyone who needs a lot of space for an affordable price.