Hello to the readers of this comment,
Although I stayed in this flat for less than my one-month plan (personal issues), I can say that this residence and its host are one of the bests.
The room was nice, the amenities were sufficient and worked well, and the internet was high-speed. Overall, it has all the necessary stuff a flat needs.
About the owner; He is a very nice man who addresses every issue you may encounter right away. We saw him on the day that we checked-in to the flat and he spoke English fluently. We are still in contact.
It is also worth mentioning that there are cafes, restaurants and supermarket in really close proximity. Being so close to the metro station is another plus for booking this place. There is also a burger place nearby, check it out!!
The gym was also really lovely. As someone who prioritize fitness even on trips, I went to the gym almost everyday. Don’t expect a full gym with 50Kg dumbbells or plates and fancy tools, but the equipment is more than enough for getting a good workout. The pools, both indoor and outdoor are also really good. I got lots of work done on my laptop sitting by the pool. It is enjoyable.
All and all, I know that if I go to Istanbul next time, I know a place to enjoy my stay.