We stayed here for around 5 nights - totally worth it. The place is near to anything we need - groceries, restaurants, coffee shops, metro and tram lines. That being said, the place is nicely tucked in at the end of a very calm and safe street - we had a very peaceful stay.
The views are amazing - it's great to wake up and be reminded of the beauty of the Istanbul and Bosphorus each and every day.
The place is also very well equipped - considering my party of 4 adults and 2 kids. It's an excellent place to stay in and recuperate after walking all around Istanbul - and if you're staying for long term - be assured that you have all the amenities you need (washer, dryer, full kitchen). In short, this is easily your home away from home!
Kadir as well is an excellent host - he personally welcomed and briefed us about the place, the nearby area and Istanbul in general, and whenever needed he responded quickly to our questions and requests.