Plus: Great location, room was very clean, had a desk and a small fridge, internet worked (a bit slow), wasn't that noisy (I'm sensitive to noise), tall rooms, good service, zero problems. Had also water boiler and a tea cup and a glass, free shower gel. Could come and go as I pleased. REWE and Lidl around 15-20 minutes walk away.
Minus:
Old and not perfectly maintained building, some staff didn't speak much English, no bidet shower (so my hemorrhoids bled during the whole stay because of intense wiping with paper), and no aircon - during +32C days the room was even hotter and could not keep the window open in the nights due to the noise from outside so most of the days I woke up sweating. At least I was able to sleep. Not the best place to stay during hot summer. Room was quite small. Easy to take a train or two to the airport.
-1 point from lack of aircon, -0.5 points from the lack of bidet shower. Still I'd definitely stay here again, but not during summer when it's hot.