Stayed at Frank's beautiful studio for 4.5 months while studying in Berlin. Frank was an amazing host, made sure I felt like the apartment was my home and fixed anything that needed fixing. The studio is small but full of character, natural light and is organised so well that it never felt claustrophobic. The location was PERFECT - right on the canal, 2 UBahn stations a short walk away, the turkish market with fresh fruit and veg outside your door (but still really quiet inside), tons of cool bars, restaurants and parks in Neukölln & Kreuzberg. Felt very safe in the area.
Only bad thing was that I had to leave :)