The apartment is great. Well equipped, silent, cozy. The host is great; you will awake with birds at your window, and you will be stil in Berlin! The only thing you may consider is that the place is a bit far from the "tourist" Berlin ( from the apartment to the Alexader PLatz you'll take 30 minutes) and there are no Markets really near (the closest is ca. 1km).
For me it was not a problem, but keep that in mind. The train station is not far, (aproximatly 400m) and the s5 (the train line) , has a good frequency.
For me (I was alone and traveling for work), it was great, exactly what I needed.