Great little flat, with everything you need for a busy few days in the city. The apartment was well located for anyone who is happy walking and within easy distance of the Hagia Sofia, Blue Mosque etc. Not immediately near lots of restaurants unlike some areas of the city - this wasn't a problem for us because we like a walk to dinner, and there is a tiny covered street with a handful of options just at the bottom of the hill.
Make sure you save the photographs of the entrance of the building, and worth noting that it's just a 1min walk up from the Green Parrot Hostel - our taxi driver really struggled to find the street, when we arrived from the airport.
Beautifully clean, fantastic and prompt levels of communication (one of my best airbnb experiences for this!), great shower, comfy bed, plenty of storage. FYI wifi really struggled to hold a connection, just in case that's important for other guests.