This is the best place to stay if you come to Istanbul. Its located in between the Old Town (Sultanahmet) and the new city (Beşiktaş etc.), which means that everything was close to us. The co-hosts were helpful 24/7, fluent in English, helped us with luggages both during check in and check out. Everything we needed to stay for a week was there and we could enjoy the breakfast with the view from 3 balconies in the flat. The flat was well prepared for our arrival.
In terms of accessibility, the flat is located in between a hill which means it might be difficult for some visitors to get to the flat and out. Luckily we did not have any problem with that.
The host took us to the bus station to the airport personally through the tram and helped with our luggage. This was a big help because the road was closed and we had to go another way to the bus stop.
Our flat had a cafe downstairs with a great view, and nice service.