Thank you so much Mehmetcan!
I stayed in the apartment as a long stay for around 5 months while studying in Istanbul.
The apartment is clean, spacious and well equipped with everything you could need.
Communication was super easy, fast responses for any queries throughout my stay. He checked up on me throughout the stay to make sure everything was okay, was understanding and a great communicator anytime I had a question.
The location is only a few minutes to Taksim Square, any the main city life, also the metro and Dolmus/Buses to anywhere you'd need to travel, which was great. The apartment seemed to be in a family / professional area of Gumussuyu, so it was far enough to not have any issues or noise from the Square, but close enough to be able to get there easily.
The photos are true to the real experience of the apartment, even better in real life I'd say, I was surprised with the space so close to the city centre.
Definitely would recommend for either a short stay or long stay.