The stay was great. Norbert is friendly and has a very cute cat who visited us every night ;) the room was very comfortable, with a great bed, a table with two chairs, a big tv with streaming options, wardrobe with plenty of space for your things as well as clean bedding and towels. We also could use some space in the fridge and the kitchen has all the equipment to cook if you want to.
The apartment is in a very quiet area, which was perfect for us. As advertised, it is far from the main attractions of Berlin but very well connected - there is a metro station about 5 minutes from the flat and it is inside a shopping mall with a Kaufland, good options to eat and buy. I could only recommend!