The room itself is mostly fine and looks as advertised on Airbnb. The room is in a house with 5 other Airbnbs, so expect a lot of company and a lot of people using the same facilities. This would be fine, but there is only a single tiny refrigerator which I would think is maybe enough for 1-2 people. Storing food can be a problem.
There are bigger issues when it comes to the owner himself. I would like to share just one negative experience. I originally rented the room for 1 month. Christian offered to repay some of the rental fees if I moved out some days sooner. Since I got another rental in the meantime, I accepted this. At first, he told me that I need to pay extra 'cleaning fees', and reduced the amount that he offered to repay. After this, he simply refused to repay anything without any explanation, and I didn't get anything.
I talked a lot with other renters in the same house, and most of them had similar experiences or other problems with him.