Starting with the positive aspects, the apartment was clean, not too far from Taksim square (about 10-15 minutes walking)and there were mini markets really close to it. Ilhan the owner as well as Taha the receptionist were very helpful and you could text them with any kind of enquiry.
Our stay would have been satisfactory if it weren't for the extremely loud noises which we later found out (2 days before our departure) came from the bakery laboratory on the ground floor. Every night approximately from midnight until 03:00-04:00 in the morning we would hear people talking and laughing very loudly and metallic objects clattering (probably for the preparation of the bakery's stuff). Since we were in the first floor the noise was unbearable and we couldn't sleep.Apart from that, even with all the apartment's heating turned off, it was so hot we had to walk around literally in our underwear. We assume the heat came from the bakery since the pavement was really hot.
If our stay would have been for more days, we would have definitely requested to change apartment.