We stayed at Isik's apartment for 4 days. The host was really flexible with the check in and checkout times. The apartment is well situated close to Taxim and Istikal street and is perfect for a stay in Istanbul. Isik is a great host, extremely welcoming and positive, provided us with a city map and public transportation card (the cost of the ticket is half priced if you have one of these). Always responds on time and is available 24/7 on his phone (he uses Viber as well :)) ). In general I will always recommended Isik and his apartment and if I go back to Istanbul one day I would love to stay in his apartment again.