We had a nice stay at Istanbul by Mehsin. The apartment is spacious and offers all necessary amenities for cooking, cleaning and relax. The communication with Mehsin was outrageous, the responses were quickly and precise.
The exact street where the house is situated is a little bit shabby, but it is very near to the one of the main attractions of Istanbul (Istklal street) and we never had any issue in any case with the neighborhood. It is actually very quiet.
On Sunday there was a nice market with high quality fruit and vegetables directly under our window, so we could take advantage from it.
The supermarket, bus stop and other necessary points are very near, so all in all I would recommend this apartment for other to so very picky Istanbul tourists who don' want to spend a fortune for a stay and is feeling comfortable staying not in the overcrowded city center, but a bit outside.