From the moment we arrived Yusuf welcomed us with such a hospitality. After a long trip he offered us a tea, and while we were dringing it he gave us so many useful advices that helped us during our stay in Istanbul.
He was also available on his mobile phone, so it was easy to reach him and ask for help.
Accommodation, even more than we expected. We had a cleaning lady who was also really professional and friendly. We musn't forget the security guard as well, another important member of Yusuf's staff.
Location couldn't be better, we were 10 minutes (on foot) away from the center, Sultanahmed, and on the other hand right below the apartment is this great restaurant Mivan, were we ate almost every day.
To sum up, definitely the accommodation we recommend.