A great flat in a good location (a little far from the metro and buses but I still like this area). You can find everything you need in this flat - the kitchen is SUPER well equipped, plus there's good internet (I mostly didn't have problems having several zoom conferences daily), washing machine, iron, etc etc. Everything is clean and good quality. There's enough space for work, cooking, eating, relaxing. The flat is light both during the day (sun) and night (because of the lamppost outside - I was using an eye mask as it's disturbing for me). The only downside is the noise - both during the day and night: there are a lot of people chatting, selling stuff etc etc.
All in all the flat is great, I'm happy I stayed here and highly recommend it to anyone who is looking for an authentic stay in Istanbul.
Oh and Safter, the manager, is great! He's always there for you should you have any problems during your stay. Always polite and caring. Thanks a lot!