I had an excellent stay with Frank. He is a great host and really friendly. His place is comfortable and well located by Schönleinstraße. It's a quick u-bahn to anywhere you'd like to go, but actually I found myself exploring the local area more than anything else. Frank is in a really interesting spot, near to lots of bars and cafes, but don't worry - the house itself is very quiet in the evenings. And what a house! Frank's place is very eclectic and fun, with his living room covered with his collection of vintage German film posters, and with a handmade wooden bar in the corner. 100% would recommend and stay again next time I'm in Berlin