We bought a business room with twin beds. The room was cramped for two adults, in my view. It was much more for a single visitor. We could open the windows fully in our atrium facing room, and this was a pleasant surprise. This room was therefore surprisingly quiet in the traditionally chaotic area of Alexanderplatz. The great, and I do mean great, thing about buying a business room here, is that you gain access to the business lounge. In this spacious area you have ample, and comfortable seating in a quiet environment. You have all manner of hot and cold drinks, snacks of all possible types, bread, and rolls, cheese, sausage, sweets and cakes, wine in the evening. In short, the business lounge was a massively positive surprise, and I would recommend visitors to buy a business room. The room being rather cramped, we spent a lot of time in the business lounge, and we loved it. To cap it all, you pay nothing extra for all the goodies in the lounge! Absolutely wonderful, and a clear winner.