A nice, cosy place, close to Taksim square and metro stations (very well located). The best way to reach the studio is from Sishane metro station.
The host was very nice, we felt welcomed. We arrived at the place before check-in time and was no problem. The person in charge with the studio gave us indications about the neighborhood and how to reach the main sites.
A fair price to pay for the studio, especially considering the location.
I totally recommend the place.