The Charlottenburg apartment is a fine place to stay for 2 or 3 days, but I can’t recommend it for a period longer than that. Many of the apartment’s problems share a single cause: the place has very very little ventilation, and absolutely no ventilation in the bathroom (except for a small window about 10 feet above the ground that literally does not open). This causes the apartment to smell after 3 days of little use. (My group was only using the place to shower and sleep, and we couldn’t bear the smell). To get some relief from the smell we had the one small window that actually worked constantly open, which came with its own set of problems. (The window has no insect screen). There’s black mold in the shower because of the constant humidity. Your wet clothes will never dry unless you bring them out to the yard — and there’s no dryer in the apartment.
There are also problems not related to the ventilation. Check in was pretty complicated, and impossible to do without turning over sensitive information (like your passport number and social security number) to a private German company. If I had known this alone I might have booked elsewhere. Getting to the place requires navigating through a maze of 5 locked doors. It was so difficult that my group and several neighboring airbnb guests just decided not to lock them.
When I finally walked into the apartment there was a large brown stain on the couch, fresh black stains on the walls, mold in the bathroom, and a lot of grime on the windowsill. There were also 2 silverfish in the bathroom, which was frightening. Neither the shower nor the sink drained properly on the first use, and the problem persisted even after I cleaned out the drain myself.
Getting in bed requires climbing a tall ladder. Not suitable for anyone with a disability that affects their mobility, for the blind, or for the elderly.
Communication was also an issue. My group is 3 was provided 2 rolls of toilet paper for 14 days. We used that maybe 3 days in. After repeated ignored requests for more toilet paper spanning multiple days, we were given just 1 roll and had to buy more for ourselves. The same happened with garbage bags.