Had a room with a small kitchenette which in effect was a fridge, one ring hob and a huge number of pots and pans plus kettle, coffee machine! It was behind a set of doors so very compact.
All communication is on their App or WhatsApp. It shares an entrance with the cafe so if you arrive when they're open you just walk through to the lift, otherwise you have to use the keypad outside (in the lift, outside your room, etc). This is all advised when you book, but does result in short delays if you need to speak to someone. Bag storage, an amenities room for irons, laundry, yoga mats(?!) and fans/heaters are all available in the basement. I chose this place because I wanted aircon but it wasn't great, so I left the window open as it was cold when I was in Berlin and used a fan. If you have front facing rooms it can be a little noisy from the street. The toilet is separate from the bathroom/washbasin and both lights come on automatically when you open the doors so anyone sleeping may get disturbed if the other gets up. My room had a lovely window seat out onto the street. I didn't eat in the cafe because of timings, but menu looked nice and they were helpful about what was offered for breakfast. Their cakes looked lovely! If you prefer a personal service and concierge, this isn't for you.