I stayed in Dilek's apartment at the end of July. It is located in Sadie,on the asian side of Istanbul in a very quiet street. That as very enjoyable after a long day of visits on the other side!
The apartment is fully furnished, anything you could need in the kitchen is available. There are taxis which drive down the street all the time and I never had to wait more than a few minutes to catch one. The train/ metro station is 6-7 minutes walking and it takes about 20 minutes to go the end of the line close to Topkapi palace. There are convenience stores around (one at the bottom of the building actually) and Bagdat street is just a few minutes away with all its shops, bars and restaurants.
The apartment is very comfortable, the only thing is that there is no black out curtain in the bedroom and it gets very bright very early. I was there in July so the sun comes up before 6am.
Dilek was very quick to answer any message I sent. I really enjoyed my stay there.