I cannot praise Gabriel and Mecnun as hosts enough. Both were extremely accommodating and thoughtful throughout my stay. They stayed up for my late check in, and even helped me plan detailed day to day itineraries for my travels in Istanbul - Mecnun is Turkish - and Amsterdam with knowledge only a local can supply. If you are planning on visiting Sweden after London, Gabriel is a veritable repository of knowledge and would be more than happy to share! However, they are also perfectly respectful of your privacy if you wish to keep to yourself.
As for the flat itself - the private bathroom is a wonderful thing, particularly for longer stays. The bedroom is, as per the listing description, small, so you may wish (as I did) to leave your luggage in the living room. Nevertheless, it contains everything you could possibly need, including a dresser and a very comfortable bed.
The location too is ideal. Stoke Newington overground station is less than five minutes walk from the flat, as are bus stops taking you directly into the city, or to Finsbury Park Interchange on the Victoria and Piccadilly lines. There is also a large supermarket just up the road, and a Whole Foods a little while further. It was delightful to stay somewhere that was so quiet, where you can feel like a local, and yet be no more than half an hour from all the hustle and bustle of central London.
I wouldn't hesitate to stay here again were the opportunity to arise!