Me and my partner stayed at this flat for a couple of days and it was perfect. Not only was it spaceous (nice kitchen, bathroom with tub, three other rooms and balcony), but it also had a really nice vibe with modern designer furnishing.
It was about a three minute walk to Bundesplatz station, which made it very simple to experience the rest of the city. Getting to the hot spots of Berlin took approximately 15 minutes. Same thing for areas like Kreutzberg and Neukölln.
The area was calm and felt very safe. And we certainly did not mind that there was a grocery store located literally three steps from the apartment complex.
Also, communication with the host was simple and straight forward. Hanna is a very nice person.
I very much recommend this flat and would stay in it again for sure.