In one sentence: the flat was superb and Simay was such a wonderful host! Definitely worth the price and very highly recommended!
About the location, the flat was perfectly located in a quite alley at the heart of an incredibly lively neighborhood. It was less than a 5 minutes walk to great restaurants and cafes and less than 10 minutes walk to Taksim square and Istiklal St. It was also only 13 minutes walk from a ferry station (Kabatas) from which you could easily go to the Prince Islands or Kadikoy. (This is particularly important because Istanbul is not a city that offers the best Taxi experience...) Also, being located at the center, yet having a great access, you can get to almost anywhere in the city with a less than a $5 Taxi fee. (If you are located in almost any other part of Taksim you’ll be stuck in the traffic for the better half of your time!)
Also, this is in fact the best location if you want to stay around Taksim as it is at the middle of the Cihangir neighborhood, which is extremely safe and with a great artistic vibe, when other areas around Taksim square are generally too crowded and unsafe.
The flat was super clean and super comfortable and quite stylish. It was obviously professionally cleaned right before our visit and all of the bathroom/ kitchen amenities were provided. The kitchen was well equipped, there were plenty if freshly dry cleaned sheets and towels available, the AC was great (our visit was in July), and the beds and the sofa beds were absolutely comfortable. The flat was also pretty spacious (we were a part of 7 and were quite comfortable) and was not located on the top floors (as many of the Airbnb postings in this neighborhood are).
And finally, about Simay! She was such a kind and accommodating host. The communication was great and check in and check out were seamless. She kept checking on us to see if we need anything, and was there when we needed anything! She is great! Thanks Simay!