I strongly recommend Ceren's home. It is fairly clean and it has almost everything for a short stay (I was there for 2 weeks). Ceren is perfectly accessible and responds to all my concerns/requests.
Just some points to keep in mind before book the house:
1) The streets in that part of Istanbul are steep.
2) The floors are thin and you could hear the neighbors on upper floor walking, though this was no problem for me.