The apartment is extremely convenient as it's located by plenty of public transportation including the U2, U8, M1 and M8. It's an easy 10-15 minute walk to the museum area and near many quick and affordable restaurants. I was staying in Berlin for work so being able to grab a quick Doner, Bahn Mi, or Bibimbap was ideal for my purposes. Kristian and his wife Peggy are great, easy going hosts. They were always available for questions.
The apartment is nicely decorated and it comes with everything you need for an extended stay. It can be a little loud in the living room as it's located on a main street, but it was never an issue for me. I never heard outside noise while sleeping in the bedroom. I would definitely consider staying here again!