I stayed at the Neuer Fritz for the Berlin Marathon. The location is convenient for getting to the start, public transit, and shakeout runs along the Spree, but there were several issues that made the stay difficult, especially for a marathon weekend.
Our room was consistently hot and muggy, despite overnight temperatures around 50F. The air conditioning/fan had been turned off for the season, and when we asked the front desk to turn it on, we were told this was not possible. Opening the windows was the only way to get airflow, but the hotel is above several restaurants, and there was significant noise until around 4 a.m. each night. They did give us a portable fan, but blowing hot, damp air around a room has its limits.
The front desk experience was also lacking. We arrived shortly after 11 p.m. and the desk was still staffed, but the employee initially ignored us as we stood outside with our bags unable to open the door. When they let us in, they told us to use the self-check-in machine since it was after 11. The touchscreen barely worked and the entire process took upwards of 20mins while the front desk worker watched us struggle.
The room was noticeably more worn than the photos suggest. We found a silverfish in the room when we arrived.
Three stars for location and because hotel experiences can be worse.