Nice and hospitable host, prompt communication. The apartment is roomy and well equipped, pictures do match. The building is a part of modern condominium, with several shops and cafeterias inside, including Carrefour. Pool and gym are good.
The nearest metro station is 5 minutes by walk, then 15 minutes to Kadiköy pier and Moda area. Taxi from Moda is about 50 TRY.
The only minus is construction yard in front of condominium, but it makes no significant noise with windows closed.
Summarizing, it is very nice place and host in Istanbul I would gladly return to.