This place is right in the middle of Besiktas, which is a very lively neighborhood with a lot of museums and great food nearby. It is walking distance from the bus, tram, and boat stations. You can walk to Dolmabahce museum, which was the most magestick one we saw, you can take a boat tour of the Bosphorus from the Besiktas dock, which was awesome (take the hop-on-hop-off boat tour), you can take the boat or bus north to Bebek, you can take the bus or tram downtown to see all the tourist attractions.
Purun is super friendly and has great communication. She welcomed us, and accommodated our flight delays. She had everything we needed, pillows, blankets, sheets, towels, etc. She suggested great local restaurants and grocery stores. The apartment has everything you need for 4 people and is very comfortable. The shower is a bit small but we were all short and fit in comfortably.
Overall, I would say that this stay was easy, comfortable, relax, and enjoyable. We had a blast and I would definitely stay here again if I go back to Istanbul.