Apostolos' place was in a perfect location... very close to transit and tons of eating options closely. Be sure to check out the bakery down the street he recommends. I ate there every morning. The place was very cute and a perfect place to come back to after sightseeing all day. So glad there was coffee every morning too! I had a friend fly in from cologne on my last night and Appollos even brought in extra sheets and made up the sofa! I can definitely recommend staying in his flat when you come to Berlin.