It's been a while ( 1965 ) but the address that comes to mind is 123 Kennedy Chadesi in Gasi Osmon Pasha and I'm sure it's misspelled. I was 14-15 y/o and very into music and playing guitar. I was lucky that my classmate who became my best friend Jim Beverett lived right across the hall. Downstairs lived Bill Templeman a 10th grader at the time. One of the landlords sons, a Turkish lad named Iciff, also played guitar so it was a great time! My girl friend live in the next building, Terry Jacobs, and we could talk form our balconys. Looking back it was all perfect.