The apartment is little bit more expensive than others in Istanbul but it is completely worth it! Great location in the heart of Beyoglu with amazing view, close to everything and very spacious. But most importantly: Bahar is a great host! We could check-in earlier as the apartment was already available. I didn’t meet her personally but she was always available for questions, warned us for a protest and was even so nice to ask a taxi station about the eventual costs to the airport.
One thing worth mentioning: you are in the middle of Beyoglu, full with restaurants and bars. If you are a light sleeper (like me) it might get loud in the night (honking of cars, prayer calls from the mosques). I always carry earplugs with me and the rest of my family didn’t have troubles sleeping at all.