Güner is a perfect host. He is not only polite, but very attentive to the needs of the guests. Berry is a solid structure: there are different types of flats (we lived in Paradise 6 with a wonderful view, the city was like on the palms of our hands), their own cafe with tasty breakfasts (mini breakfasts are an everyday gift, but we tried different food there and were pleasantly satisfied). The staff on the reception (located in the main Berry building near the cafe Berry (sorry, I don't remember the exact names of all the buildings:)) is polite and helpful. They have a lot of things that are thought out like Istanbul cards with a deposit which can be used in all public transport, the everyday breakfasts that I have already mentioned, and welcome drinks gifts, the refrigerator with water so the first day from your journey you won't find yourself thirsty after the plane and the roads). They even have the airport transfer, which we, honestly, didn't use as we were up to all what the Istanbul can offer us, including public transport, but the option itself (transfer) is quite convenient.
Inside Paradise 6 is very clean and it has everything to live in.
There are shops nearby and a lot of nice places are not that far away.
We walked like 25 kilometers almost every day across Istanbul and were very happy.
P.S. Güner helped me a lot with booking the table and with giving some advices, as I was proposing to my gf, so Teşekkürler (THANK YOU!!!) For the breakfast surprise after the proposal, for the kind and attentive approach, and just for being a good man!:)
I really liked staying there, so yeah, if I would plan to visit Istanbul again, I know where I would stay (maybe try different Berry buildings, if they have the similar view on the city:)