We had a wonderful stay at Melt and Ceng's place. The apartment is really beautiful and very stylish - we lovely hanging out in the living area with the view of the church across the road.
The hosts were fantastic. They replied to our messages very quickly, and brought us extra towels and bedding when we asked for it. Nunu, who was there when we arrived, was a great help - she spoke on the phone to our taxi driver so that he knew where to take us when we arrived.
The area was perfect for us - close to amenities, restaurants and bars and a really cool vibe in Beyoğlu. We walked to the touristy area (blue mosque, grand bazaar etc) most days. It took us about 40 minutes but you could easily get the tram.
The only downsides to this flat are that it's quite noisy. We heard hoovering above us a couple of mornings, which woke us up, and a baby in another flat in the building. Also the sofa bed in the lounge isn't super comfortable. If someone is staying in the lounge it's worth bringing an eye mask to sleep, because it's really light in the morning.
Overall a great stay! We had a really lovley time here and I have already recommended the place to a friend.