Ömer is the perfect host, very welcoming and provided a very relaxed environment for me to enjoy my stay. He is very knowledgable about Istanbul and it was great to learn more about the history of the city and Turkey. Ömer was also very helpful with other things and went beyond what would normally be expected of a host.
The room itself is a nice size for a single bedroom. It has a desk and the wifi speeds were fast, enough for me to do my online conference calls. The apartment is clean, the communal living areas are relaxing, the kitchen is a good size and has everything you would need to prepare your own meals if you wish.
The location is a little away from the centre of Kadikoy, but walking into the centre wasn't a problem, it's a safe place and I was able to explore some quieter parts of the area. If needed, there are bus stops close by (2 minute walk) which will take you to Kadikoy centre in 10 minutes, from which you can choose to hop on the ferries or explore the main area of Kadikoy.
Overall, I would not hesitate to recommend Ömer's apartment to any solo traveller.