Yusuf is a great person and a very friendly host. He is always ready to help with anything. He is really an expert for Istanbul right next to the main attractions. You can ask him for any info, he has a clear and easy to follow solution ready. He is very sociable person so don't be hesitant to chill around and have some jokes. I had a room with an awesome view opening to the Bosphorus. It can be a little loud in summers with seagulls and a mosque but it should not be a problem in the night. You can chill on the balcony with nice breeze of the sea. That was a great experience... I definitely recommend him as your host and the place to stay.