Went to Cologne for weekend. Bit of trouble getting into the lobby as had been text a doorcode, but it didnt work. Another guest in the lobby opened the door. There is no reception staff, a fact that's not clear from the front page of website. Couldn't check in, as was too early. The lockers will only fit a small cabin size bag, not a standard suitcase, again this is not mentioned on the website. There is no other storage. We left and came back once emailed received confirming room number. We checked in and created 2 door cards, which was hassle free. Got to the room and it hadn't been cleaned from previous occupier. We found a cleaner on the same floor and she said she would contact the management. Waited in the lobby, then a woman with a laptop appeared and assigned another room quickly. Why she cannot be at a desk in the lobby instead of hiding in the back I dont know. The room was nice, decorated well and was clean. No kettle though, just a coffee machine. Paid for a King size bed but it was twin beds. Couldn't turn the air extractor off in the bathroom.
The breakfast café was ok, just sandwiches and pastries, coffee and juices. Reasonably priced though. Overall an average stay, just don't think the 'no staff' is the right business model in my opinion. There needs to be better access to all sorts of information. There is a tel number you can call though. Just not convenient. Hotel is near the U bahn, so made getting around very convenient, especially with KölnCard.