This flat is absolutely gorgeous, airy and clean, with an amazing view. It's about 3-4 minutes walk from one of the main metro stops (Karakoy) so it's in an excellent location to explore Istanbul. Zehra was easy to reach throughout the week, with the exception of when we first arrived (make sure you arrange check-in beforehand, or you might be stuck out in the snow for half an hour like we were!).
The huge problem we had with this flat was the noise level. It is located right off a busy street so the flat is never quiet (it is right next to a mosque as well, although we came to really enjoy the call to prayer on a morning :) ). We had a lot of problems sleeping - the windows are single glazed, and the panes themselves are a mess, both letting a lot of street noise in. Other than that one big thing, we did enjoy our trip and the flat. It was always lovely and warm.