Definitely, ***** stars!
We had the apartment to ourselves and it was great!
Oliver is very friendly and best as a guest. Oliver's apartment is really beautiful, modern and clean.
The kitchen has an impressive coffee machine, sofa and large TV with surround sound (PS: Oliver has a great playlist). It has a wonderful small garden with a lawn and a swing where you can sit in and enjoy it.
The area is quiet, safe and not far from the center. Location is excellent, Ostkreuz (S-ban station) is 10min walk or Treptower (bus). Definitely highly recommended! We will come back.