We loved our stay at Kinga's place. The bed was large and comfortable and we especially appreciated the large dining table. The kitchen is well stocked with utensils, pots and pans, etc if you want to cook your own meals. The apartment is in a quiet building, but near some nice bars and restaurants, as well as walking distance to groceries and other interesting shops.
When we arrived the weather in Berlin was hotter than usual and the apartment stays pretty cool. We did borrow a fan from a local friend (we are hot sleepers) but it was pretty comfortable even without the fan.