Seda's house is very beautiful, and located in a very peaceful place and is a fantastic choice for being away from the busy Istanbul. It is however, not too far from Istanbul, and takes about one hr drive to the centre of town.
You must rent a car, or it would be difficult to go around, as it is in rural areas. Local people and the gardener/guard (Abdullah) are very helpful and friendly. It is also located near beautiful scenic beaches of the black see, and some amazing hiking tracks.
The quality of the house would improve hugely with some more lighting (as there is not enough lighting for dark days and nights), some more cleanings, and a Wifi Internet. Some stuff in the bathroom also need fixing. Otherwise, it is a fantastic place.
I would certainly recommend her place, if you are into the nature and enjoy being in secluded area, not too far from the magical city of Istanbul.