Staying at Cerith's flat in Istanbul was one of the highlights of my month in Turkey. On top of being very friendly, he was extremely generous with his time and his knowledge of Istanbul (and Turkey). During my stay, Cerith happened to have some time away from work and he offered to join me as I walked around. His company and his intimate familiarity with Istanbul were hugely appreciated.
Prior to meeting him - in the few weeks leading up to my visit - Cerith was very prompt with responding to my questions/emails.
As a host, he is also very accommodating.
All of my expectations were exceeded in Istanbul, and in no small part because Cerith was a wonderful host. I highly recommend staying with Cerith: "Central Part of Istabul, Taxim".