When we looked (via Airbnb) for a place to stay during our Berlin visit, our attention was immediately drawn by Heike's apartment. The rooms and facilities looked great, the location seemed perfect. So we booked it for 5 days. Where we fooled by too optimistic listings and tricky photographs? No way. It is a great, modern apartment with all facilities you need, including an excellent bed. Heike gave us a warm welcome when we arrived. She is a very good host!
Friedrichshain (where the apartment is situated) is an interesting, vivid area and from there you easily travel to Mitte, Kreuzberg, Tiergarten etc. Metro Station Frankfurter Tor is just a few steps away. Bicycles (the best way of transportation) can be hired opposite the street. Many shops, restaurants etc. nearby. Highly recommended.