Basma is a wonderful and open-minded person and I really recommend to stay in her apartment. Before we went to Istanbul she send us an E-Mail with all the informations we needed to find her house (maps, pictures, descriptions). By metro you get directly from the Atatürk-Airport to her place. The location is perfect. Just a 5 minutes walk to the metro and 3 minutes to the tram, which bring you into the historical centre of Istanbul. There are many restaurants and supermarkets in the neighborhood.
Everything was clean, comfortable and we had plenty of room for our stuff. But you shouldn't expect a 5 stars hotel. It is an accommodation for people who are on a tight budget. However I think it is more important to stay with someone who makes you feel welcome and Basma is definitely this kind of person. We had nice conversations with her and she really took care about us.