I stayed for nearly 2 months in the shared room with 4 beds. Vefa was a very nice host, he texted me everytime someone moved in to my room so I was informed everytime. The lock system is okay once you get used to it. It isn't that complicated but you have to understand how it works. The place has some pretty comfortable mattresses and is very clean over all. I would recommend this place to anyone, who is interested in a top located simple room in Berlin.