The apartment was great, very clean and really close to the Hauptbahnhof which was good for me because I arrived late at night with lots of luggage. The only thing was that, although the bedroom door was lockable from the outside, so when I left during the day my luggage could be locked in my room, the lock didn't work from the inside, so at night I couldn't lock my bedroom door. However I felt very safe in the apartment and Mario answered my queries very quickly.