The apartment was light and modern, great for two people, the shower was a little small but worked great. And everything was clean, I got very quick answers to all my messages and even without having met the hoste they were very friendly.
The only issues are that there is (obviously as stated) no WLAN and that the stairway up to the apartment and the hallways to the apartment smell very bad. Also the basement where the washing machines and dryers are looks like it is under construction, but they work well and I had no issue
I asked the hosts about this and they told me they sadly can't do anything about it, because they don't own the building, so I don't hold that against them, but I thought it is worth mentioning.
So all in all if no WLAN is not a problem this is a great central apartment to stay at, just walk quickly through the rest of the building.