First of all, Kartal is a nice guy who allowed us to check-in few hours earlier coming for it from work (which was very good for us after 24-hour trip including night in a train) and was always there for any questions through a messenger. The apartment is located in the best place we saw in the city - what is now known as Kadikoy is the oldest populated site on Istanbul's territory (as Chalcedon, check it out), and now it is a very modern district with hundreds of restaurants and shops, where you can feel the spirit of youth, freedom and hospitality. There is no big supermarket just next to the place (though there are dozens of small), but 15 minutes away by feet you can find a mall with a hypermarket. Also there is an actual market a few blocks away in the direction to the ferry terminal. And yes, one of the best parts of chosing Kadikoy for stay is that if you would have chosen the European side, you could never use a ferry, and this would be wrong - as for me, a ferry ride is one of the best Istanbul attractions and unforgetable experience, especially on the sunrise/sunset. Next, the apartment has everything you need in terms of a short stay and looks the same as on the photos. Don't waste your time cooking - me and my wife were choosing the apartment with kitchen equipment, but coming here we realised that in a city with such great food and restaurants it is meaningless. Just go downstairs and right there you will find a place with great coffee (Malavita), and a few places with breakfasts (try menemen), and you will totally manage to find a place to try kebap, manti, fish (look at the market) and dishes of international kitchen. And if the weather is bad, don't be afraid to install a food delivery app and order food directly to the apartment. We had a great time in Kartal's apartent and would be happy to return, I can totally recommend this place.