Xperior's place is in an excellent location, close to lots of great food, shops and easy public transport into the other attractions in Berlin. Xperior was very quick to respond to messages and happy to provide helpful and local information when needed.
There is a water heater in the main bedroom - which does provide excellent hot water and heating but is quite noisy at night. Using earplugs really helped with this problem though.
My teenage kids loved sleeping on the high couch area, and they thought the decoration and wall map very cool (the map was helpful too).