The apartment is very beautiful, extremely clean and comfortable. The surroundings were beautiful (especially facing the church) and it wasn't very noisy outside as compared to being on a main road. The host was friendly and hospitable, checking in was seamless and she was on hand to answer questions/offer advice.
The locals around the area were also very friendly and helpful if you were lost or needed help. I will definitely return to Beyoglu on my next trip to Istanbul!