we stayed at hakan and Turan's place for two weeks. I can say that our stay was enjoyable and good. hakan was always available for anything at any time. the caretaker of the apartments was also available for help always. the house is situated in a nearly central position, 10 min walk from İstiklal and around 20 mins to taksim. its in a heart of people's every day life so it give an somewhat authentic experience. it have two small grocery store very near. there is also a tekel ( alcohol shop) really near the house which all of them are actually open even in late night hours. the house well connected with autobus to metro and other public transportations and also well connected to other parts of the Istanbul, there two bus station within 5 minutes walk. maybe the only problem ( which is actually not a problem but is a part of authentic experience) is that there is a mosque really near the place so every time there are call for prayers ( specially in early morning) you could hear it really loudly. the apartment itself is clean and rally well equipped, it has really everything for your needs. maybe it is best for 2 adults than three ( or maybe better for 2 adults and a child )because the sofa bed is not that big for a adult and also the room itself is not enough spacy for three adults. the stairway to the units are so straight and can make baggage transportation a little bit difficult but you should know that this is and renovated old building so it is normal to have such stairways.
as I have said, it can be an authentic way to experience life in Istanbul ( specially the Istanbul's cats), you can feel the real way of life and how people live their every day life. I recommend this place