We stayed at this apartment for five days. To be honest, it was hard to find this place cause we arrived from Gokcen airport which is quite far. The guy in the apartment helped us a lot and has provided everything that we wished including city map and Istanbul card(underground and tram). He was very kind and supportive. I've met Tevfik once but Alex has been there all the time. In terms of location, this apartment is close to the tram and underground stations and close to the Ayasofiya and Sultan Akhmet mosques. Nearby a lot of shops.
The rooms were clean but i couldn't recognise the smell. It came from sewage or anything else I don't like it. Except this everything was good.
Thank's Tevfik and Alex for hosting us and wish you all the best!