I stayed in Christiana and Marius' place for around 6 months. Overall, it was super - Christiana and Marius are very good and responsive hosts.
Some stuff to note
1) There is a small storage space next to the bed behind the curtains
2) The glass door to the bathroom does not close off towards the rest of the flat
3) There is a small freezer section in the fridge
4) The location is really, really good. Ideal for getting into 1. Bezirk (on foot) and located within a few minutes is a Lidl, Hofer and SPAR