Ahmet and his girlfriend were very nice and his place was very comfortable. I met them on the evening I arrived and we had dinner together (they shared some delicious food they had cooked!). They don't speak English and I don 't speak Turkish but we got by with translation using smartphone. The arrangement was that I had a very comfortable bedroom and the rest of the space (kitchen, bathroom, ...) in their comfortable apartment was shared. The location in Beylikduzu is nice, close to many shops and restaurants. I like this part of Istanbul. The marina is to the south, and there are some amazing walking/biking trails nearby that run north/south through the river valley that goes down to the coast. I enjoyed walking those trails! I highly recommend Ahmet's place if you need a place in Beylikduzu.