Despite having a confirmed reservation, I arrived at the Seminaris after travelling for 16 hours from CA, had to wait about 30 min for them to service 2 customers in front of me, only to be told there was no room available as they'd overbooked. I was shunted over to the Steglitz International for 4 of 5 days (where there was no hot water most days and had to take cold showers, WiFi that was either absent or barely functional so I couldn't work, breakfast staff who serve everybody else coffee but not you, no soap in the shower dispensers causing one to run out to the sink for a handful mid-shower, and conflicting information in the room guides about when breakfast was actually served), then I had to check out of there before a day trip to Hannover (carrying my luggage there and back to Berlin) as I was put back in the Seminaris that Fri. All in all, just piss-poor.