i stayed here for only a couple of night, which seemed such a waste. These huge, well-appointed apartments located in a quiet building right in the centre of city would be a great base for a much longer stay. Note that in Berlin being in the centre doesn't mean much except you're close to the shopping. It's such a spread out city.
The apartments would be palatial for 2 people and comfortable for a family of four. There's a fully equipped kitchen. Free fitness, sauna and wifi.
Breakfast is outrageously expensive (EUR 18) but wonderful all the same. If you're paying your own way then I suggest you buy your own food and use the kitchen. If you are spending someone's money then enjoy the breakfast!
Limited lobby opening hours mean checkout can be a pain, especially at weekends. Why not have some form of electronic checkout? Or at least put copy of bill under door of last night.
Don't confuse this with Mandala Hotel