Merve is a great host and extremely accommodating. The view from the apartment is as amazing as the pictures, if not better. It definitely feels like your are living in a local persons home. You are fairly close to public transport that will get you to Sultanahmet in about 25 mins, 13 min walk to Taksim The location is removed from the tourist mayhem and close to lots of hip local restaurants and cafe.
A few things to keep in mind: There are no elevators and you have to go up three winding sets of flights, so be carefully if you have heavy luggage or bad knees. Also, the closest public transport (tram) is about a 9 min walk downhill on the way there and uphill on the way back. My wife is pregnant and she found the uphill/downhill difficult so we shortened our stay and Merve was extremely understandable about the situation. When we visit Istanbul again we will definitely consider staying there again!