We stayed in Michel's place for more than a month and it was great stay for us. To review more detaily;
The house: It was quite large, you get to have a duplex flat plus a terrace with a magnificent view over Golden Horn and watching sea and eating/drinking/working at the same time was a valuable experience. If anyone else intends to stay for longer, there are enough kitchenware equipments to cook. Only minus thing is Internet connection is not accurate and slow sometimes but it is related with the neighbourhood, I cannot blame the host for that.
Location/Neighborhood: It was perfect to reach to Istiklal Street only by a few minutes walking. All cool attractions near Taksim within walking distance. But the neighborhood is not that peaceful. Buildings are located very close to each other and the next building is so close to you, you feel less privacy when you sleep in your bedroom. If locals read this review, I gotta say this neighborhood is quite similar to Tarlabasi and they will understand what I mean.
The Host: Michel is one of the kindest hosts we ever met, he helped us in any situation. You will have the best host if you choose to stay here.
So all and all: It was 9/10 stay for us and we would love to choose here one more time if we ever get the same opportunity.