The apartment is indeed well located and Felix is a great host. I stayed for 1 month as I moved to Berlin due to my new job while I was hunting for an apartment for myself. The apartment is a well decorated Altbau just next to all you will need for your stay (public transit, shops, groceries, etc). The room was in perfect order when I arrived with lots of space for my things. I had a very positive experience and highly recommend it for anyone interested.