Efe is a very friendly and helpful host.
I stayed at his apartment in Beşiktaş - and I just loved it. It is close to all the sites in that part of Istanbul and it is very quite as it is located on a small side-street. So, you can feel in the middle of it all and yet secluded.
Being on the ground floor, no worry of carrying your suit-cases up the stairs. And, it has its own private green patio - an unexpected but very welcome surprise!
When I'll come to Istanbul next time, I will be definitely contacting Efe to stay there again.