The place is located just in the heart of Berlin. We have walked to every attraction of Berlin and everything was easy to find.
I would give 5 starts regarding the location.
Peter was also a very communicative host and he responded to my messages very quickly.
Unfortunately the place wasnt as clean as I expected it to be. The apartment was full of dust and full with dog hairs. Also the bed sheets werent washed, so make sure you take your own with you.