This place is very good for a stay in Berlin. The space is very clean and well designed, but both beds are best for people with good mobility, since one of them is up some pretty high steps and the other one is in a nook you have to crawl into. The kitchen and bathroom are very well sized and provided. If you are using the space as a base for spending most of the time out and about, four people can be there with enough comfort, but three of us were working remotely from the apartment and it was a little tight at times. Location is good, some ~10 minutes from the closest trains, with some options for eating or having coffee, but it's not a very lively area itself. Karolina was super responsive and helpful every time I reached out with any question. I recommend this place for young people who are planning to spend most of the time exploring the city.