Ilona's place is lovely - perfect location with lots of shops, restaurants and bars in the surrounding area of Kreuzberg. The flat itself is very stylish and had everything we needed, allowing us to cook a few meals and enjoy a chilled night in after walking around Berlin for the day.
Prior to staying Ilona was quick to respond to messages and was on hand throughout our stay in case we needed anything.
I would definitely recommend staying here if you're visiting Berlin.