Isik is an excellent host - his communication was excellent and he was very helpful! The flat was as described and perfectly located as a base for exploring the entire city.
My only concern is that it could be a bit noisy at times with construction and people staying up into the early hours of the morning. I'm sure the latter would not be a problem for everyone - I'm just an early riser.
I would definitely recommend if you're looking for a place close to the action!