Kelly's place is perfect. it take no longer than 10 mins to reach trams M1, 10 and 12 and also the S Bahn. there are near by groceries and a lot of cafes and restaurants. you can walk to Alexander plazt, it took us less than 30mins and along the way there are really nice shops. Kelly's place is very cozy and is equipped with everything you need. Kelly always responded within 1 hour. I would go back and stay at her place again and i definitely recommend it to anyone who wants to explore Berlin.