Unsure if this is bad design or a social experiment. For a place that is highly controlled in terms of sound (decibel rating) and interior “architecture” layout, on a basic level, a lot of basic comforts for a rental are not met. First of all, the cleanliness could be improved - seemed like the floors were not cleaned or are heavily worn in common areas and the bathroom, especially the black tile one. Also, I would not sit in any of the cushions in the living room, they have suspicious white stains on them. These are easy to clean - they are Ikea ottomans with zippered cushion covers…………Secondly, only 2 of the beds were made (granted there were only 2 of us) but they were placed in the most inconvenient areas for reasons I will get into next. Third, the heat was not really adjustable. While I am grateful for heat especially during cold winters in Berlin, the heat in the flat made it pretty unbearable at night, I couldn’t sleep well most nights. The knob on the main heater is on backwards and not aligned correctly so you’re never really sure which setting you are on, so by the time you play with it, it’s either so unbearably hot in the flat or it’s just less unbearable/not much cooler than what it was. The bathroom heaters don’t seem to adjust at all. So if you’re sleeping in the lofted areas, especially the one close to the front of the apartment/close to the main heater, you are roasting in heat. I should also mention that most of the windows are locked (you need a key), you can only open the windows in one bathroom (which opens to a courtyard aka not safe to leave bigger windows open and you’re street level so upper smaller windows only) and above window street facing. Leaving these open plus using a fan they had were the only ways we could fall asleep. I did message the host about the heat but I don’t know if they realize the knob doesn’t work correctly so I wasn’t very pushy about it. Next, if you’re sleeping in the lofts, the upper windows facing the street are not covered, so the brightly lit house numbers from across the street shine brightly in your line of vision (with eyes closed too of course) and if you’re in the back loft not only do you get that but also the filtered light of the courtyard house number which is also on all night. I’m not usually super sensitive to light when sleeping, so the combo of these lights plus heat were especially bothersome. Additionally, from a noise perspective, one of the bathrooms has a door that is locked off from some sort of staircase/office on the other side. Depending on the hour, it sounds like you have people in the bathroom with you while you take a shower, moving around, conversing, etc. It is very strange. If you’re sleeping in the lofts, you also have the sound of people walking around about 18 inches from your face. Like many others have stated, there’s also a million messages you will get about being quiet building up to your stay. I initially wasn’t bothered by this because I am quiet but the notes in the apartment about decibel ratings / a meter somewhere in the flat are really off putting especially with all of these basic considerations I’ve listed above. I’ve also previously lived in Berlin for several years and yes Germans are noise sensitive but besides an old German lady yelling at you here and there about running the washing machine too late, is the next aggro thing I’ve experienced. On the positive slide, the communication was pretty quick, the check in was straightforward with images provided and the location very convenient for getting around. I’m not sure if the hosts haven’t been to this flat in a while but some minimal adjustments and making sure the flat is cleaned to a better standard would make this a pretty good Airbnb, otherwise it just feels like Squid Games Light.