I spent about 4 months in Annika's apartment. I was in Berlin for business, and it was a great flat to live in. It is close to public transportation, Annika or Johannes always replied straight away if I had any questions or concerns and everything you could be needing when living long term in a flat was there. In my personal opinion, the flat is great for one person if you are staying long term, however is more than big enough for 2+ people when staying for shorter periods. I worked at Potsdammer Platz and walked to work every day. When walking through Tiergarten it takes about 25-30 minutes to walk to Potsdammer Platz and other locations around such as Brandenburger Tor. I had a great stay, thank you to both Annika and Johannes for all your help and support while I was there.