Marlen's apartment is heavenly. The plants are extraordinary. She did a wonderful job decorating and clearly has an artistic streak. The kitchen is huge by Berlin's standards. The balcony is gorgeous with a view of bunch of trees overlooking a nearby park. The bathroom is also really large and has a very nice bathtub. I would happily stay here again, and would highly recommend Marlen's place to fellow travelers.
Only issues were the key pick-up and drop-off for check-in and check-out, which was honestly a hugely stressful ordeal. The key was left at a Späti and the name written on the key pick-up was not my name. (I don't know if it was a name at all -- it was barely legible.) I have lived in Germany for six months and my spoken German is usually enough to get by, but in this situation I was completely out of my depth. (For a foreigner, I believe this situation would have been impossible to navigate.) My boyfriend is German and even he had a really difficult time trying to communicate if the key that they had was in fact the right key by sharing the address it was for and when it was left. The key had something like "Ludmrdila" written on it, so the man at the Späti did not think the key was for me since the name written did not seem to match the name on my ID. (My name is Lynda.) We left the Späti with the key and felt really unsure if it was going to work for the door to our AirBnB. We could finally relax and take a deep breath when it did in fact work! Also, Marlen wrote that I should have dropped the key in the postbox when I left but I am not sure where this information was presented. My grandmother had just passed away (I was extremely close with her) and my partner and I were in a rush since we realized we had mistaken the location for the bus station in Berlin and barely had enough time to get there.
Other than that, it's a perfect AirBnB in an idyllic, quiet nature location that's also close the hip, bustling areas of Berlin in Neukölln and Kreuzberg. Highly recommend.