The apartment has more than enough space for two people, big windows with lots of light coming in and all the needed furniture. The washing machine is in the basement, you can use that in the evening.
The location is really quiet, 5 minutes of walk from the Istiklal street with all the food, groceries, shops, malls etc.
WiFi is OK during the day, in the evening (due to the load from other people in the building, I suppose) it was hard to do video calls with turned on camera and connection broke occasionally.
Eddie is a wonderful host, ready to help and friendly.
Same goes for a housekeeper - a really nice and friendly guy, always ready to help.
Definitely recommend this one and would stay here for longer periods or when visiting Istanbul next time.