Value: Great value for the cost. Perfect for solo travelers and couples. But not ideal for more than 2 people.
Host: Kerem is a great host who responds to inquiries and requests promptly. Very polite and good communicator.
Cleanliness: Very clean.
Location: The apartment is in the Yildiz area of Besiktas. You need to climb up a steep hill to arrive at the apartment. Good exercise. But not ideal for people with mobility concerns. You can arrive at the center of Besiktas, the ferry station, and bus stops in about 15 minutes by walking. You can also walk to Nisantasi, the fashion district, in 20 minutes by walking but you need to walk up steep hills. I'm mentioning all this information because finding a taxi in Istanbul are very difficult these days. So, don't assume a cab will pick you up from your apartment whenever you need one.
Apartment itself: Cosy (i.e. small) but perfectly adequate. Nicely furnished. Smart TV. Washing machine. Small dishwasher. I liked the apartment so much that I extended my stay. The mattress could be more comfortable. But I put a comforter on top, which acted like a mattress topper, and it was quite comfortable after that.