Overall, the Catalonia Berlin Mitte is a great hotel, but my most recent stay there was spoiled by the fact that they closed their restaurant on the Saturday night to all guests because they had catered for a large coach party of elderly people.
The restaurant is advertised as being open from 12pm to 10pm so when I went down to grab a burger and beer at 9pm, I expected to be able to eat. However, the barman told me in a very abrupt manner that the kitchen was closed because of the large party.
There was no advance warning of this from hotel staff and due to the time of night, almost all other eating establishments in the immediate vicinity were either fully booked or closing. There was no signage, just a curt and sullen reply that there was nothing they could do. As such, I was unable to get a meal until breakfast the next morning.