Helga is a great host and very helpful with tips and advice. I would not hesitate to stay at her house again and have already recommended it to a few friends considering going to Berlin. If you do stay be sure to take the S25 northbound one stop to Tegel where there is some outstanding shopping to be done but also a great traditional southern German pub that serves very good food called Hax N'Haus. If you love ramen then I would also highly recommend Mia Ramen just two doors down.