This January, I stayed two (2) nights. The room was spacious and everything you need; a bath and a shower. The internet speed was fantastic.
A hotel reception is under construction; so, its very massy and unpleasant when entering the hotel. In the morning, specifically, at or about 10:18 in the morning, local German time, someone knocked on the door, and entered. It was later identified a housekeeper named Rosa who ignored the sign DO NOT DISTURB.
You can hear other people in adjacent rooms. The heat was moderate but not as warm as I wished.
Lidl is around the corner. From Berlin Main Station it was 40 minutes walk or you can take Bus M41. A bus station right on the intersection. I paid 3€ via credit card (tap pay) on the bus from Berlin Main Station to Anhalter