Esin's place is ideally located if you want to be based on the European side. Just a 2-3 minutes from all the hustle and bustle of Taksim Square and İstiklal Caddesi, a 5-minute walk from the metro at Taksim, and a 10-minute walk from the tram at Fındıklı. All in all, couldn't have asked for a better location.
The apartment itself was beautifully decorated, clean, comfortable, spacious and has a great vibe to it. The only drawback was that on the hottest nights during my 1-month stay at the height of summer, it was a bit difficult to fall asleep with the lack of AC but I don't see this being a problem 99% of the time.
If you want to spend a long time in Istanbul. I would recommend doing it here :)