Hikmet was a great host. His replies to initial inquiries were quick and also to subsequent questions prior to our trip. Once we were in Istanbul, he was there to welcome us and take care of any requests that we had. Most of all, he was able to accommodate my in-laws in another apartment right next to my apartment, and arrange for a reasonable pick up and drop to airport. The apartment was just as described. Small for 5 people but that's how it will be in such a great location - only 10 min walking to blue mosque/hagia Sofia etc. But having just one washroom between 5 of us was a slight struggle. Might be a good idea to at least have a wash basin in the big courtyard. Lastly, just like any other apartment in old Istanbul, there are no elevators. So it can be challenging for people with mobility issues.
Overall- A+ to Hikmet!