Overall, it is an old building in an old busy area with lots of alleys, shops, restaurants and coffee shops. You should have a GPS not to get lost. It is close to Taksim square, lovely neighbourhood, airport shuttles, and public transport.
The landlady lives with her partner. She is kind, communicates well, and they have a lovely cat. She kindly let me check in 2 hours earlier and allowed me to use their table and chair for my online interview.
Cons: The room is really small (2x3 m) , cold room, radiator not working ( I think you should ask them for a heater in cold seasons), dark building corridor, the apartment and unit number is not included in the address provided (you should ask for it, otherwise you need internet or Turkey SIM card to call or text her to open the door for the check in, I had to ask a lovely man in the neighbourhood to call her), the couple are sometimes noisy and they sometimes argue violently ( I am worried about intimate partner abuse), as the washroom is shared, it could be occupied by residents for a long time, so use as soon as vacant!