We loved our stay in Istanbul. The flat is in a great location near to some lovely restaurants and good shopping areas. The views from the flat over the Bosphorus to the old town are fabulous. We only found out about rooftop access on the last day, that was lovely too.
Traffic was a bit noisy at night, but we slept ok with ear plugs in. The shower could do with a bit of a sort, bit leaky, and the attachments to hold the nozzle don't work. Those were just minor things.
We had a lovely stay.