Great apartment and Sedat is a very professional host. We stayed a week and although not a big apartment it is very comfortable, very clean and well laid out. The cleaning lady Gül is exceptionally great and always has a smile on her face. Every day we would come home to see that she had cleaned. Sedat arranged transfers for us and everything was efficient. We would definitely stay here again.
Tip: you're going to be walking uphill to reach the sights. The best way is straight across from the apartment heading (steeply) up the hill. A 10 minute walk will bring you to the tram line (Beyazit tram stop) which will take you just about everywhere you need to go in Istanbul.