There is nothing truly wrong with this hotel. It just had some annoying details. The building was in good shape, and well maintained. My room was clean, and everything worked.
But...
The "included" wifi is for only one device per room. They charge for additional devices. Even if you pay for upgraded wifi (per device), you are still limited by the network strength. Wifi for me and some other guests was useless in the rooms. I do not know which rooms worked, or if only the second floor had problems. No good reasons were given at the desk. I gave up and just worked in the lobby. I think this is not acceptable for many business travelers who carry multiple devices that use wifi.
The booking description on Expedia does not offer an included breakfast option, suggesting that it must be included already. It is not. The price is reasonable, but it felt like a surprise. I always include the breakfast when it is offered.
There is no AC, despite being a modern appearing hotel. This is not emphasized, though I know this is common for many Deutsche buildings. The advantage of thick sound insulating glass is lost if you need to open the windows. And you must choose between leaving your room visible to the street or having drapes block the air flow.
Overall, it is clean and affordable, despite little items. And maybe lots of this is in the fine print of the listing, but I now expect a certain standard and consistency in Expedia listings after so many bookings.