The area of Kuzguncuk is propably amongst the best places to stay in Istanbul. It is a very quiet neighbourhood with Bosporus access in only 5 minutes of walking along the main street with many restaurants and cafes. There are also a few kiosks nearby. The appartement is as described fully refurbished, very clean and offered everything we needed. The key drop-off with Suhas friend Aylen was very easy, she also greeted us very friendly and showed us around the house upon arrival.
Wheelchair accesability to the basement sleeping area with own huge bathroom is no problem, however, there are some steep steps to take if one wishes to enter the kitchen area on the ground floor. It was manageable with our grandmother, however, it might not be the best choice for others who require special assistance.
Other than that everything was simply perfect. Relaxing on the terrace on the third floor next to the Masters Bedroom is a nice way to end the day after walking the Bosporus boardwalk in nearby Ûsküdar during sunset.