Grimms Potsdamer Platz in Berlin

Dirty room and the worst mattress I’ve ever slept on. This hotel has been one of my worst experiences so far.
We were told the room was ready at the reception, but when we entered, a service staff member was still inside “checking” it. The floor had neither been vacuumed nor mopped—you could clearly see dust and hair. The same issue was in the bathroom, with hair on the shower floor.
The mattress was terrible: uneven, likely 10–15 years old, and extremely noisy—you could hear the springs every time you moved. We both woke up with back pain. Luckily, it was only for one night. There was also no kettle in the room to make tea. The rooms are also very loud and when someone is moving in the room next to you, you hear the stumbling.
The staff were friendly, but I don’t pay over €100 just for friendly service—I expect a clean room and a reasonable level of comfort.

Few hours before our arrival we received a mail that our reservation has been cancelled (29.04.2025). When we called the hotel the man who answered was rude and dismissive and hung up the call. We were stuck at Berlin airport without a hotel to go to. I wouldn't recommend staying here even for free.

Paid in full when booked .On check in and check debited me full amount again, with no apology. Breakfast wait 10-25 mins every day and very poor buffet with no hot food as always empty. Booked double room and had to press hotel as put in twin.TERRIBLE