We (3 students) stayed at Mersins flat for 4 month. We loved it! It was the perfect place to stay for that time. The location is great. You can reach Istiklal Street and Taksim (with a Metro Station) easily by walking. The ferry station Kabatas is only 20 minutes walk away. So all of Istanbul can be perfectly discovered. There are two supermarkets just a 1 minute walk away. We loved the fruit and clothes market every Sunday right in front of our door. So you can get everything you need for life in the direct neighbourhood.
The flat itself was super nice. The style is reduced Scandinavian. There are enough sheets and towels for tree people. Also in the kitchen all tools are available.
All in all we can really recommend the flat. We had such a great time there. :)