This place was truly better than expected. I will be elaborating from the beginning of my experience till we left.
Before booking Jan answered everything really quickly and nicely. We requested having a baby crib in the room and we found a baby crib, a bath tub, and baby food as a welcome gesture which was extremely nice.
The check-in process was very easy and Jan has described everything clearly before we reach, but we also found his assistant which was there to help us and guide us.
The apartment was as described as in pictures only it was bigger and nicer than our expectations. The kitchen is equipped with everything you might need during your stay, there is one AC in the apartement located in the living area, it was really good and strong to keep us from Istanbul's summer heat. The living room had a sofa which becomes a large bed with storage box underneath the sofa. The storage had the bedding set (sofa sheet, padded sheet to make it more comfortable, pillows, and blankets).
The TV has netflix, youtube, and many entertainment stuff. There is also a nice private garden with a table and chairs, which we used to dry our clothes on the drying rack (also equipped in the apartmemt).
There is one bathroom in the living room, which we found a pack of toiletries (shampoo, soap, sponge, toothpaste, shower gel) and 3 towels for each guest. There is also a shower room in the bedroom.
The bedroom was very big and everything was well organized. It also has a fan for ventilation as it has no windows but it wasn't an issue as the AC was strong enough to cool the room.
We requested an additional blanket at midnight and before we wake up it was hanged outside. Also, seagulls threw pieces of bread in the garden and we informed Jan, he fixed the issue within minutes and sent a cleaner as well as turkish delight as an apology. The service is honestly very professional, efficient, and kind.
The location of the apartment is one of its kind. It is not on a steep hill, there is a supermarket right in the building, a pharmacy next to it, a salon, many beautiful local shops, and amazing food and coffeeshops. If you walk uphill, you reach galata tower and taksim street. If you walk downhill, you're right by Tophane Tram station, then if you cross the street, to your right is Karakoy and to your left is Galata port.
In conclusion, everything about the experience is 10/10 and deserves a 7-star rating and I will definetly only stay there from now on when I visit Istanbul.
Thank you Jan for your professionalism and for your effort to make our stay comfortable.