I spent almost a week in this wonderful room and totally loved it and Merve as a host. The house is close to Taksim (10-15 minutes walk) and it's really easy to find the way to it. I always misunderstand the directions, but this time it worked out perfectly well. Also there is a nice shop not far from the house. So you can get almost everything you need.
Staying in a place like this makes you feel yourself as a part of this amazing city and at the same time stay impressed as a tourist. I really enjoyed my visit!
And of course I am really thankful to Merve for her help and advices!