Me, wife and 2 kids stayed at Erens apartment for 5days in June 2019. Eren apartment is as close to the description and as good as what we see it in the picture, its very well located and very close to Taksim (6min Walk), Istiklal Street ( 5min walk ), Galata Tower (15min Walk) and easy access to main tourist attraction by taxi with min 20-25Turkish Lira. ( Tram and train is much cheaper, we used a taxi due to kids and strollers).
The apartment was in very good condition, clean and neet. there are 2 AC's one in the living room and one in the master bedroom, this cover the entire apartment. wifi is fast enough to manage your day to day online activities.
Eren is a very good host, always reachable on his phone or through Airbnb message and was very helpful throughout our stay.
The apartment is located in a kind of hilly area so if your not a healthy person or traveling with kids and stroller will be a bit difficult although I enjoyed carrying the stroller and pushing to climb to burn some calories. ( trust me the amount of sugar and meet you eat in Istanbul you need to workout hard to burn )
there are plenty of restaurants, coffee shop and grocery shop close by so eating won't be a problem
Overall am very happy with my stay and will recommend Erens Apartment.