I stayed at Sanem's place with my girlfriend, Nicole, for a couple of weeks. The room was very big, with a wardrobe. The bed was firm and the room was nice and dark in the mornings with a homey feel. The kitchen and living space and bathroom were all clean with nice furniture. There was no microwave in the small kitchen, but everything ele we needed was there.
The wi-fi internet was reliable and the house was well kept and away from the noise of the street, making it a good spot for us to do some work in between sightseeing. Sanem is a nice person and she made us feel welcome, although we didn't see her much as she kept nocturnal hours. She provided some great tips for our time in Istanbul.
The apartment is at the end of the popular Nishantasi shopping and eatery district, has a big supermarket just across the road and is only a 10 minute walk to Osmanbey Metro station or 30 minute walk to Taksim.