Frank's place is fantastic, wouldn't hesitate to recommend it or to come back here next time I'm in Berlin.
Good location, 5 minute walk to the tram, 10 mins to the U bahn, then very quick into the centre. Lovely bakeries 3 mins up the road too.
Really spacious apartment, light and airy. Well equiped kitchen, powerful shower, comfy bed. Frank was a great host, met me when I arrived and explained everything. Quiet area too.