Totally recommend
The apartments are located in the European part of the city, which is much cleaner and nicer than the Old Town. There are many good restaurants and cafes for breakfast, I recommend Guney Restaurant - 5 minutes from the apartment, and on the other side of Istanbul - Roof Mezze 360 for dinner at sunset (40 min walk, or 10 min taxi - 20 TL).
The apartment was absolutely clean and comfortable for our stay.
It was very caring that we found a lot of bottled water in the kitchen, on hot days, this is what we needed, and it is very pleasant that they took care of us.
1 day - I had to work, Wi-Fi is super fast, which was important.
It was difficult to climb the stairs with our suitcases to 4th floor and without an elevator in the building, narrow winding staircase (but overall, that was a minor issue, considering that the apartment and our staying experience was very good)