The hotel is right outside the Berlin Main Train station and it is very close to all random checks to this hotel-main transaction. The hotel has easy access to airports (it is so cheap from Tegel (TXL) airport). Overall the room was clean (even though the toilet bowl would need to be cleaned more). The hotel has kitchen sharing facility and the receptions were helpful. I will definitely stay again.
I was lucky. I have to travel to Berlin on these dates and didn't aware if there was Berlin Marathon on the same date. All hotels near train station was all fully booked and miraculously I got this corner room with 2 window view, including the TV tower. I can see the hotel is one of the historical building (saw the picture in DDR museum 😁) though it refurbished well. The breakfast area were pack with all the runners, but just enjoy the moment:) Will definitely comeback to Park Inn if I'm having the chance to visit Berlin again.