Garen is a really great Host. He was available for all of my requests, at any time of day.
The apt is great for a large group of people, since it can easily accommodate 8 people. There is a kitchen equipped with everything you need, the TV`s have all kinds of channels and the WiFi has a good speed.

The location of the apt is great. Just 4/5 min walking to Istiklal street. If you`re staying here you are within walking distance from everything actually (Istiklal, Taksim square, Galata Tower and even the old city does not take longer than 30 min walking).
The buildings on the street is not entirely renovated and the street is very narrow (especially if you`re driving a big car like we did) so it may give a bad impression at first (it sure did to us). But just ignore this! the people who leave here are really nice and we didn`t feel unsafe at any hour of day or night.
The apt itself is clean, recently renovated (all Ikea inside :)) but since the building is quite old you can indee feel the moist and humidity inside. Again, it`s nothing to worry about.
All in all, it is a great large apartment, in a really good location and I think it can provide you with a more authentic image of Istanbul than any other place would.
Thanks Garen for the really pleasant stay.