My family and I enjoyed our stay in Prenzlauerberg. I lived in Berlin years ago, but never had the opportunity to explore the East. This flat is ideally situated to use the S-bahn or tram ("M") system. I heartily recommend downloading the BVG app on your phone to help you quickly navigate Berlin on the fly :-) And purchase your ABC card right at Tegel for the week (or however long you need) which was cost and time efficient for us! If you arrive at Tegel, take the TXL bus to Buesselstr and connect with the ring S-Bahn (S41) to Prenzlauerallee. About a 35 minute trip to the flat.
The flat itself was clean and of a nice size. We were comfortable during our stay (although the bed in the little room was extremely hard). The description of the flat and its amenities was correct. We were especially happy that we did not have to bring a hairdryer!
Shopping for groceries was easy - we used the Penny markt at the end of the street. I also recommend a kebab restaurant adjacent to the M stop on S Prenzlauerstr. - it was open late and far tastier than the one further up the S-Bahn line on Schoenhauserallee.
Would love to stay at the flat again for the next trip - hopefully in Summer :-)